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Search: id:A098484
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| A098484 |
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Expansion of 1/sqrt((1-x)^2-12x^4). |
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+0
3
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| 1, 1, 1, 1, 7, 19, 37, 61, 145, 397, 979, 2107, 4591, 10915, 26857, 63649, 146347, 339751, 808885, 1936717, 4588705, 10803133, 25559287, 60893551, 145231309, 345462145, 821110051, 1955736379, 4668132067, 11146642903, 26605635949
(list; graph; listen)
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OFFSET
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0,5
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COMMENT
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1/sqrt((1-x)^2-4rx^4) expands to sum{k=0..floor(n/2), binomial(n-2k,k)binomial(n-3k,k)r^k}
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FORMULA
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a(n)=sum{k=0..floor(n/2), binomial(n-2k, k)binomial(n-3k, k)3^k}
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CROSSREFS
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Cf. A098481, A098482, A098483.
Adjacent sequences: A098481 A098482 A098483 this_sequence A098485 A098486 A098487
Sequence in context: A003215 A133323 A002407 this_sequence A155443 A155405 A155448
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Sep 10 2004
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