|
|
A109546
|
|
(4^(n+1)-(-1)^n 9 )/5.
|
|
0
|
|
|
5, 11, 53, 203, 821, 3275, 13109, 52427, 209717, 838859, 3355445, 13421771, 53687093, 214748363, 858993461, 3435973835, 13743895349, 54975581387, 219902325557, 879609302219, 3518437208885, 14073748835531, 56294995342133
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
a(n)= 2^n th coefficient of - eta(z)^5 eta (3z) eta (6z)^4/ eta(2z)^4.
|
|
LINKS
|
|
|
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
|
|
|
|