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Search: id:A115098
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| A115098 |
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a(0)=2, a(n)=3*a(n-1)-3. |
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+0
1
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| 2, 3, 6, 15, 42, 123, 366, 1095, 3282, 9843, 29526, 88575, 265722, 797163, 2391486, 7174455, 21523362, 64570083, 193710246, 581130735, 1743392202, 5230176603, 15690529806, 47071589415, 141214768242, 423644304723, 1270932914166
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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a(n)=A067771(n-1), n>0. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 11 2008]
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FORMULA
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a(n)=(3^n+3)/2
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EXAMPLE
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a(4)=(3^4+3)/2=84/2=42=3*a(3)-3=3*15-3
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MAPLE
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seq((3^i+3)/2, i=0..30);
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CROSSREFS
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Sequence in context: A053561 A006403 A129960 this_sequence A036418 A120589 A110181
Adjacent sequences: A115095 A115096 A115097 this_sequence A115099 A115100 A115101
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KEYWORD
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easy,nonn
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AUTHOR
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Miklos Kristof (kristmikl(AT)freemail.hu), Mar 02 2006
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