OFFSET
1,8
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..1000
FORMULA
G.f.: -1 + Product_{j>=1} (1 + x^(2*j^2)/(1-x^(j^2))). - Emeric Deutsch, Jun 21 2009
EXAMPLE
a(12)=3 because we have 444, 441111, and 1^(12). - Emeric Deutsch, Jun 21 2009
MAPLE
g := -1+product(1+x^(2*j^2)/(1-x^(j^2)), j = 1 .. 10): gser := series(g, x = 0, 90): seq(coeff(gser, x, n), n = 1 .. 79); # Emeric Deutsch, Jun 21 2009
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 02 2009
STATUS
approved