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Search: id:A125820
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| A125820 |
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a(n)=((1 + 7Sqrt[2])^n + (1 - 7Sqrt[2])^n)/(2). |
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+0
2
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| 1, 1, 99, 295, 10193, 49001, 1086723, 6926543, 119265217, 910405105, 13389536259, 115088367703, 1528961752529, 14221495172249, 176752280339811, 1732989592387775, 20610950377737217, 209321891217088609
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OFFSET
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1,3
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FORMULA
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a(0)=1, a(1)=1, a(n)=2*a(n-1)+97*a(n-2) for n>=2 . G.f.: (1-x)/(1-2*x-97*x^2) . - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 12 2006
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MATHEMATICA
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Expand[Table[((1 + 7Sqrt[2])^n + (1 - 7Sqrt[2])^n)/(2), {n, 0, 30}]] (*Artur Jasinski*)
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CROSSREFS
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Cf. A125819.
Sequence in context: A031500 A044431 A044812 this_sequence A008902 A008882 A156757
Adjacent sequences: A125817 A125818 A125819 this_sequence A125821 A125822 A125823
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Dec 10 2006
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