OFFSET
0,3
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..3000
Index entries for linear recurrences with constant coefficients, signature (2, -4, 1).
FORMULA
Convolution inverse of A253909.
G.f.: (x-1)^3/(x^3-4*x^2+2*x-1).
a(0) = 1; a(n) = -Sum_{k=1..n} k^2 * a(n-k). - Ilya Gutkovskiy, Feb 02 2021
PROG
(PARI) N=99; x='x+O('x^N); Vec(1/(1+sum(k=1, sqrtint(N), k^2*x^k)))
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Jun 24 2018
STATUS
approved