OFFSET
0,2
COMMENTS
Number of partitions of n into distinct parts with two kinds of one. - Andrew Howroyd, Jun 21 2018
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..1000
C. G. Bower, Transforms (2)
FORMULA
G.f.: (1+2*x) * Product_{k=2..infinity} (1+x^k).
PROG
(PARI) {my(n=60); Vec((1+2*x)*prod(k=2, n, 1+x^k + O(x*x^n)))} \\ Andrew Howroyd, Jun 21 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
a(0)=1 prepended and terms a(50) and beyond from Andrew Howroyd, Jun 21 2018
STATUS
approved