OFFSET
0,36
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..10000
Wikipedia, Pentagonal number
MAPLE
seq(coeff(series(mul(1-x^(k*(3*k-1)/2), k=1..n), x, n+1), x, n), n=0..140); # Muniru A Asiru, May 31 2018
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, May 31 2018
STATUS
approved