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Search: id:A092807
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| A092807 |
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Expansion of (1-6x+4x^2)/((1-2x)(1-6x)). |
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+0
1
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| 1, 2, 8, 40, 224, 1312, 7808, 46720, 280064, 1679872, 10078208, 60467200, 362799104, 2176786432, 13060702208, 78364180480, 470185017344, 2821109972992, 16926659575808, 101559956930560, 609359740534784
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Second binomial transform of A054881 (closed walks at a vertex of an octahedron) With interpolated zeros, counts closed walks of length n at a vertex of the edge-vertex incidence graph of K_4 associated with the edges of K_4.
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FORMULA
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a(n)=6^n/6+2^n/2+0^n/3
a(n)=A074601(n-1), n>0. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 08 2008]
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CROSSREFS
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Cf. A092803.
Sequence in context: A143388 A027282 A006195 this_sequence A074601 A052701 A151374
Adjacent sequences: A092804 A092805 A092806 this_sequence A092808 A092809 A092810
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Mar 06 2004
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