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Search: id:A034171
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| 1, 6, 42, 315, 2457, 19656, 160056, 1320462, 11003850, 92432340, 781473420, 6642524070, 56716936290, 486145168200, 4180848446520, 36059817851235, 311811366125385, 2702365173086670, 23467908082068450, 204170800313995515
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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W. Lang, On generalizations of Stirling number triangles, J. Integer Seqs., Vol. 3 (2000), #00.2.4.
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FORMULA
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a(n) = 3^n*A007559(n+1)/(n+1)!, A007559(n+1)=(3*n+1)!!!; G.f.: (-1+(1-9*x)^(-1/3))/(3*x).
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CROSSREFS
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Cf. A007559, A034164. a(n)= A035529(n+1, 1) (first column of triangle).
Convolution of A004987(n) with A025748(n+1), n >= 0.
Sequence in context: A004982 A093388 A162968 this_sequence A153293 A145301 A107266
Adjacent sequences: A034168 A034169 A034170 this_sequence A034172 A034173 A034174
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KEYWORD
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easy,nonn
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de)
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