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Search: id:A087503
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| A087503 |
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a(n)=(a(n-2)+1)*3, a(0)=1, a(1)=3. |
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+0
3
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| 1, 3, 6, 12, 21, 39, 66, 120, 201, 363, 606, 1092, 1821, 3279, 5466, 9840, 16401, 29523, 49206, 88572, 147621, 265719, 442866, 797160, 1328601, 2391483, 3985806, 7174452, 11957421, 21523359, 35872266, 64570080, 107616801
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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a(n) = a(n-1) + A038754(n).
See A133627 for an essentially identical sequence. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 08 2008
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MAPLE
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a[0]:=0:a[1]:=1:for n from 2 to 100 do a[n]:=3*a[n-2]+3 od: seq(a[n], n=1..33); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 17 2008
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CROSSREFS
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Sequence in context: A115855 A128128 A006330 this_sequence A133627 A092176 A000991
Adjacent sequences: A087500 A087501 A087502 this_sequence A087504 A087505 A087506
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Sep 11 2003
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