OFFSET
1,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..500
EXAMPLE
1/((1-x)*(1-3*x^2)*(1-5*x^3)*(1+2*x^4)* ... ) = 1 + x + 4*x^2 + 9*x^3 + 16*x^4 + ... .
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Jun 24 2018
STATUS
approved