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Search: id:A109546
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| 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; listen)
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OFFSET
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1,1
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COMMENT
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a(n)= 2^n th coefficient of - eta(z)^5 eta (3z) eta (6z)^4/ eta(2z)^4.
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FORMULA
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a(0)=-1, a(n)=4*a(n-1)-(-1)^n * 9, n >=1.
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EXAMPLE
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a(3)=53, since (4^4+9)/5=53
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PROGRAM
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(PARI) for (n=1, 100, print( (4^(n+1)-(-1)^n *9 )/5));
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CROSSREFS
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Adjacent sequences: A109543 A109544 A109545 this_sequence A109547 A109548 A109549
Sequence in context: A089004 A094107 A107009 this_sequence A018545 A028349 A083860
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KEYWORD
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nonn
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AUTHOR
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Kok Seng Chua (chuaks(AT)ihpc.a-star.edu.sg), Aug 30 2005
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