A151760 G.f.: Theta^4, where Theta = Sum_{k>=0} x^(2^k).

0, 0, 0, 0, 1, 4, 6, 8, 13, 12, 10, 16, 18, 16, 20, 24, 13, 12, 18, 16, 22, 24, 28, 24, 18, 16, 28, 24, 20, 24, 24, 0, 13, 12, 18, 16, 30, 24, 28, 24, 22, 24, 36, 24, 28, 24, 24, 0, 18, 16, 28, 24, 28, 24, 24, 0, 20, 24, 24, 0, 24, 0, 0, 0, 13, 12, 18, 16, 30, 24, 28, 24, 30, 24, 36

Offset: 0

Author

N. J. A. Sloane, Jun 22 2009

Keywords

• nonn

Comments

Number of ways to write n as an ordered sum of 4 powers of 2. - Ilya Gutkovskiy, Feb 02 2021

Links

• Robert Israel, Table of n, a(n) for n = 0..10000

Crossrefs

Cf. A151758.

Programs

Maple

N:= 10: # for a(0) .. a(2^N)
g:= add(x^(2^i),i=0..N)^4:
S:= series(g,x,2^N+1):
seq(coeff(S,x,j),j=0..2^N); # Robert Israel, Mar 27 2020