OFFSET
1,3
REFERENCES
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
E. M. Palmer, R. C. Read and R. W. Robinson, Balancing the n-cube: a census of colorings, J. Algebraic Combin., 1 (1992), 257-273.
FORMULA
For n > 1, a(n) = Sum_{k=0..2^(n-2)} A(n,2*k) where A(n,2*k) = N(n,2*k) - Sum_{i=0..k-1} binomial(2^(n-1)-2*i, k-i) * A(n,2*i) with N(n,2*k) as defined in A006853 [From Palmer et al.]. - Sean A. Irvine, Aug 16 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
a(7) from Sean A. Irvine, Aug 16 2017
STATUS
approved