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Search: id:A135522
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| A135522 |
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a(n) = 2a(n-1) + 3a(n-2). |
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+0
2
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| 2, 3, 12, 33, 102, 303, 912, 2733, 8202, 24603, 73812, 221433, 664302, 1992903, 5978712, 17936133, 53808402, 161425203, 484275612, 1452826833, 4358480502, 13075441503, 39226324512, 117678973533, 353036920602, 1059110761803
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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Also: inverse binomial transform of A135520. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 17 2008
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FORMULA
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O.g.f.: [ -5/(3x-1)+3/(1+x)]/4. a(n) = [5*3^n+3*(-1)^n]/4. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 23 2008
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CROSSREFS
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Cf. A060925.
Sequence in context: A076424 A165301 A072440 this_sequence A107240 A099171 A012307
Adjacent sequences: A135519 A135520 A135521 this_sequence A135523 A135524 A135525
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KEYWORD
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nonn
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Feb 19 2008
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 23 2008
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