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%I #8 Feb 02 2021 16:47:20
%S 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,
%T 16,28,24,20,24,24,0,13,12,18,16,30,24,28,24,22,24,36,24,28,24,24,0,
%U 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
%N G.f.: Theta^4, where Theta = Sum_{k>=0} x^(2^k).
%C Number of ways to write n as an ordered sum of 4 powers of 2. - _Ilya Gutkovskiy_, Feb 02 2021
%H Robert Israel, <a href="/A151760/b151760.txt">Table of n, a(n) for n = 0..10000</a>
%p N:= 10: # for a(0) .. a(2^N)
%p g:= add(x^(2^i),i=0..N)^4:
%p S:= series(g,x,2^N+1):
%p seq(coeff(S,x,j),j=0..2^N); # _Robert Israel_, Mar 27 2020
%Y Cf. A151758.
%K nonn
%O 0,6
%A _N. J. A. Sloane_, Jun 22 2009
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