OFFSET
1,4
COMMENTS
Number of partitions of n into powers of two where every part appears at least twice (=original definition), if 2^0 is accepted as a power of two. - R. H. Hardin, Jul 04 2009
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..1000
FORMULA
G.f.: Product_{j>=1} (1 + x^(2*2^j)/(1 - x^(2^j))). - Emeric Deutsch, Jun 28 2009
EXAMPLE
a(9)=3 because we have 444222, 4422222, and 2^9. - Emeric Deutsch, Jun 28 2009
MAPLE
g := product(1+x^(2*2^j)/(1-x^(2^j)), j = 1 .. 20): gser := series(g, x = 0, 145): seq(coeff(gser, x, 2*n), n = 1 .. 69); # Emeric Deutsch, Jun 28 2009
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 02 2009
EXTENSIONS
Definition corrected by Emeric Deutsch, Jun 28 2009
STATUS
approved