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Search: id:A074581
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| 0, 2, 13, 81, 504, 3136, 19513, 121415, 755476, 4700770, 29249425, 181997601, 1132436852, 7046319384, 43844049029, 272809183135, 1697490356184, 10562230626642, 65720971788709, 408933139743937, 2544489349890656
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OFFSET
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0,2
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FORMULA
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a(n)=7a(n-1)-5a(n-2)+a(n-3), a(0)=0, a(1)=2, a(2)=13. G.f.: (2x-x^2)/(1-7x+5x^2-x^3).
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MATHEMATICA
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CoefficientList[Series[(2*x-x^2)/(1-7*x+5*x^2-x^3), {x, 0, 40}], x]
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CROSSREFS
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Cf. A000073.
Sequence in context: A000179 A037739 A037634 this_sequence A020059 A162772 A079752
Adjacent sequences: A074578 A074579 A074580 this_sequence A074582 A074583 A074584
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KEYWORD
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easy,nonn
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AUTHOR
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Mario Catalani (mario.catalani(AT)unito.it), Aug 24 2002
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