OFFSET
0,3
LINKS
R. H. Hardin, Table of n, a(n) for n = 0..1000
FORMULA
G.f.: 1 / (Product_{k>0} (1 - x^( (k^2 - k)/2 + 1))). - Michael Somos, May 29 2012
EXAMPLE
1 + x + 2*x^2 + 2*x^3 + 4*x^4 + 4*x^5 + 6*x^6 + 7*x^7 + 10*x^8 + 11*x^9 + ...
a(4) = 4 since 4 = 2 + 2 = 2 + 1 + 1 = 1 + 1 + 1 + 1 is a partition in 4 ways. a(7) = 7 since 7 = 4 + 2 + 1 = 4 + 1 + 1 + 1 = 2 + 2 + 2 + 1 = 2 + 2 + 1 + 1 + 1 = 2 + 1 + 1 + 1 + 1 + 1 = 1 + 1 + 1 + 1 + 1 + 1 is a partition in 7 ways. - Michael Somos, May 29 2012
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 06 2009
STATUS
approved