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A130979
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G.f. : 7/(3+4*sqrt(1-28*x)).
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5
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1, 8, 120, 2192, 44248, 949488, 21237168, 489517344, 11544312984, 277190766896, 6753051796240, 166505875155936, 4146984734796016, 104174408364697952, 2636346768784492128, 67149645964991840832, 1720072455615130558488
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Number of walks of length 2n on the 8-regular tree beginning and ending at some fixed vertex. Hankel transform is A135315. [From Philippe DELEHAM, Feb 25 2009]
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FORMULA
| a(n) = Sum_{k=0..n} A039599(n,k)*7^(n-k). - Philippe DELEHAM, Aug 25 2007
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CROSSREFS
| Sequence in context: A165231 A004381 A166179 * A133308 A191098 A151834
Adjacent sequences: A130976 A130977 A130978 * A130980 A130981 A130982
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KEYWORD
| nonn
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AUTHOR
| Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Aug 23 2007
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EXTENSIONS
| More terms from Olivier Gerard (Sep 22 2007).
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