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Search: id:A133474
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| 0, 0, 0, 1, 6, 24, 81, 252, 756, 2241, 6642, 19764, 59049, 176904, 530712, 1592865, 4780782, 14346720, 43046721, 129146724, 387440172, 1162300833, 3486843450, 10460412252, 31381059609, 94143001680, 282429005040, 847287546561
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OFFSET
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0,5
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FORMULA
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b(n)=a(n) with one 0; c(n)=1, 3, 6, 9, 9, 0, -27, ... = A057083; b(n+1)=3b(n)+c(n)?
O.g.f.: -x^3/[(3x-1)(3x^2-3x+1)]. a(n)=6*a(n-1)-12*a(n-2)+9*a(n-3). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 02 2008
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CROSSREFS
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Cf. A131571, A047790.
Sequence in context: A001788 A068711 A047790 this_sequence A052150 A118043 A124807
Adjacent sequences: A133471 A133472 A133473 this_sequence A133475 A133476 A133477
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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), Nov 29 2007
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 02 2008
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