OFFSET
0,4
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..50
FORMULA
a(4*n+1) = a(4*n+2) = 0.
PROG
(PARI) a(n) = polcoef(prod(k=1, n, (x^k+1/x^k)^k), 0);
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Dec 23 2021
STATUS
approved