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Search: id:A098483
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| A098483 |
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Expansion of 1/sqrt((1-x)^2-8x^4). |
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+0
3
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| 1, 1, 1, 1, 5, 13, 25, 41, 85, 205, 473, 985, 2021, 4365, 9785, 21673, 46965, 101581, 222745, 492665, 1087237, 2388749, 5251065, 11587529, 25633045, 56697933, 125345113, 277283353, 614212133, 1361824525, 3020426681, 6700678377
(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)2^k}
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CROSSREFS
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Cf. A098480, A098482, A098484.
Sequence in context: A099776 A133322 A146590 this_sequence A147205 A146875 A064276
Adjacent sequences: A098480 A098481 A098482 this_sequence A098484 A098485 A098486
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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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