OFFSET
0,2
COMMENTS
Euler transform of period 16 sequence [2,1,3,1,3,0,2,0,2,0,3,1,3,1,2,0,...].
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..10000
FORMULA
G.f.: (sum_{n>=0} x^A074378(n))/(sum_n (-x)^n^2).
a(n) = A001935(2n).
a(n) ~ exp(Pi*sqrt(n)) / (2^(7/2) * n^(3/4)). - Vaclav Kotesovec, Nov 15 2017
MATHEMATICA
Table[Count[IntegerPartitions[2n], x_ /; ! MemberQ [Mod[x, 4], 0, 2] ], {n, 0, 38}] (* Robert Price, Jul 28 2020 *)
PROG
(PARI) a(n)=local(X); if(n<0, 0, X=x+x*O(x^(2*n)); polcoeff(eta(X^4)/eta(X), 2*n))
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Michael Somos, Mar 03 2003
STATUS
approved