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Search: id:A092803
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| A092803 |
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Expansion of (1-5x)/((1-2x)(1-6x)). |
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+0
2
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| 1, 3, 12, 60, 336, 1968, 11712, 70080, 420096, 2519808, 15117312, 90700800, 544198656, 3265179648, 19591053312, 117546270720, 705277526016, 4231664959488, 25389989363712, 152339935395840, 914039610802176
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OFFSET
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0,2
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COMMENT
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Second binomial transform of expansion of (1-3x)/(1-4x). Third binomial transform of A054878 (closed walks at a vertex of K_4). With interpolated zeros, counts closed walks of length n at the vertices of the edge-vertex incidence graph of K_4 associated with the vertices of K_4.
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FORMULA
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a(n)=2^(n-2)(3^n+3)=(6^n+3*2^n)/4
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CROSSREFS
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Sequence in context: A073996 A003483 A128602 this_sequence A020052 A096471 A140097
Adjacent sequences: A092800 A092801 A092802 this_sequence A092804 A092805 A092806
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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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