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0, 6, -12, -156, 1680, 21264, -592032, -5712096, 3903889925349216, 381679872, 1095380736, -384803443200, 2445989918208, 547003852781568
a(n)/(n!*(-4)^n) must be equal to a_n given in Table 2 of the Oitmaa's paper. Domb & Wood's a(1)-a(7) satisfy this relation, a(8) = -5712096 and a(9) = 390388992 do not. After a(7), The terms in the sequence would continue: -5349216, 381679872, 1095380736, -384803443200, 2445989918208, 547003852781568, approxData section are unambiguously retrieved from a_n. The next term a(14) is approximately -10793475537844224. Oitmaa's a_n agree with these numbers in all given digits, except for the The last given digit of a_8 is probably a typo. - Andrey Zabolotskiy, Feb 24 Jun 18 2022
a(8)-a(9) corrected, a(10)-a(13) added by Andrey Zabolotskiy, Jun 18 2022 using Oitmaa's data
a(n)/(n!*(-4)^n) must be equal to a_n given in Table 2 of the Oitmaa's paper. Domb & Wood's a(1)-a(7) satisfy this relation, a(8)-a(9) do not. After a(7), the sequence would continue: -5349216, 381679872, 1095380736, -384803443200, 2445989918208, 547003852781568, approx. -10793475537844224. Oitmaa's a_n agree with these numbers in all given digits, except for the last given digit of a_8. - Andrey Zabolotskiy, Feb 24 2022
a(n)/(n!*(-4)^n) must be equal to a_n given in Table 2 of the Oitmaa's paper. Domb & Wood's a(1)-a(7) satisfy this relation, a(8)-a(9) do not. After a(7), the sequence would continue: -5349216, 381679872, 1095380736, -384803443200, 2445989918208, 547003852781568, approx. -10793475537844224. - Andrey Zabolotskiy, Feb 24 2022
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