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A131521
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G.f. : 9/(4+5*sqrt(1-36*x)).
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5
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1, 10, 190, 4420, 113950, 3128140, 89608780, 2647358920, 80065458910, 2466432898300, 77115832253380, 2440820453410360, 78053018025315340, 2517915855707814520, 81839894422876183000, 2677554649095487584400
(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 10-regular tree beginning and ending at some fixed vertex. Hankel transform is A135321. [From Philippe DELEHAM, Feb 25 2009]
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FORMULA
| a(n) = Sum_{k=0..n} A039599(n,k)*9^(n-k). - Philippe DELEHAM, Aug 25 2007
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CROSSREFS
| Sequence in context: A056174 A033714 A169959 * A113373 A045756 A144772
Adjacent sequences: A131518 A131519 A131520 * A131522 A131523 A131524
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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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