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Search: id:A099492
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| A099492 |
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A Chebyshev transform of the Padovan-Jacobsthal numbers. |
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+0
2
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| 1, 0, 0, 2, -1, -4, 5, 2, -16, 12, 27, -56, -3, 140, -144, -186, 547, -140, -1175, 1606, 1120, -5096, 2775, 9360, -16807, -4584, 45664, -38070, -69657, 167276, -11347, -393142, 450896, 467108, -1595725, 586584, 3235221, -4905692, -2556720, 14641550, -9572661, -25171740, 50306641, 6820750
(list; graph; listen)
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OFFSET
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0,4
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COMMENT
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A Chebyshev transform of A052947, which has g.f. 1/(1-x^2-2x^3). The image of G(x) under the Chebyshev transform is (1/(1+x^2))G(x/(1+x^2)).
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FORMULA
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G.f.: (1+x^2)^2/(1+2x^2-2x^3+2x^4+x^6); a(n)=-2a(n-2)+2a(n-3)-2a(n-4)-a(n-6); a(n)=sum{k=0..floor(n/2), C(n-k, k)(-1)^k*sum{j=0..floor((n-2k)/2), C(j, n-2k-2j)2^(n-2k-2j)}}.
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CROSSREFS
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Sequence in context: A051176 A038719 A125751 this_sequence A075302 A028509 A047949
Adjacent sequences: A099489 A099490 A099491 this_sequence A099493 A099494 A099495
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KEYWORD
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easy,sign
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Oct 19 2004
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