OFFSET
1,1
COMMENTS
a(n)= 2^n th coefficient of - eta(z)^5 eta (3z) eta (6z)^4/ eta(2z)^4.
FORMULA
a(0)=-1, a(n)=4*a(n-1)-(-1)^n * 9, n >=1.
EXAMPLE
a(3)=53, since (4^4+9)/5=53
PROG
(PARI) for (n=1, 100, print( (4^(n+1)-(-1)^n *9 )/5));
CROSSREFS
KEYWORD
nonn
AUTHOR
Kok Seng Chua (chuaks(AT)ihpc.a-star.edu.sg), Aug 30 2005
STATUS
approved