OFFSET
0,6
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..500
FORMULA
Convolution inverse of A293072.
PROG
(PARI) nn = 50; Vec(prod(m=1, nn, 1/(1 - x^m + 2*x^(2*m))) + O(x^nn)) \\ Michel Marcus, Oct 05 2017
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Oct 05 2017
STATUS
approved