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Search: id:A130976
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| A130976 |
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G.f. : 8/(3+5*sqrt(1-16*x)). |
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+0
5
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| 1, 5, 45, 485, 5725, 71445, 925965, 12335685, 167817405, 2321105525, 32536755565, 461181239205, 6598203881245, 95157851939285, 1381842797170125, 20187779510360325, 296499276685062525
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Number of walks of length 2n on the 5-regular tree beginning and ending at some fixed vertex. Hankel transform is A135292. [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Feb 25 2009]
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FORMULA
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a(n) = Sum{k, 0<=k<=n}A039599(n,k)*4^(n-k). - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Aug 25 2007
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CROSSREFS
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Sequence in context: A093140 A137233 A001449 this_sequence A151831 A133305 A062023
Adjacent sequences: A130973 A130974 A130975 this_sequence A130977 A130978 A130979
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KEYWORD
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nonn,more
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Aug 23 2007
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EXTENSIONS
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More terms from Olivier Gerard (Sep 22 2007).
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