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Search: id:A126063
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| 1, 1, 2, 3, 6, 4, 15, 30, 20, 8, 105, 210, 140, 56, 16, 945, 1890, 1260, 504, 144, 32, 10395, 20790, 13860, 5544, 1584, 352, 64, 135135, 270270, 180180, 72072, 20592, 4576, 832, 128, 2027025, 4054050, 2702700, 1081080, 308880, 68640, 12480, 1920
(list; table; graph; listen)
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OFFSET
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0,3
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LINKS
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P. Luschny, Variants of Variations.
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EXAMPLE
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Triangle begins:
...........1.
...........1,.......2
...........3,.......6,.......4.
..........15,......30,......20,.......8
.........105,.....210,.....140,......56,.....16
.........945,....1890,....1260,.....504,....144,....32
.......10395,...20790,...13860,....5544,...1584,...352,....64
......135135,..270270,..180180,...72072,..20592,..4576,...832,..128
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MAPLE
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M := proc(n, k) if n = k then 2^n ; else 0 ; fi ; end: A001147 := proc(n) if n = -1 then 1; else doublefactorial(n) ; end: end: G := proc(n, k) A001147(2*n-1)/A001147(2*k-1) ; end: A126063 := proc(n, k) local j; add( G(n, j)*M(j, k), j=0..n) ; end: for n from 0 to 10 do for k from 0 to n do printf("%d, ", A126063(n, k)) ; od: od: - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 23 2007
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CROSSREFS
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Sequence in context: A097275 A130879 A119741 this_sequence A137524 A156055 A096357
Adjacent sequences: A126060 A126061 A126062 this_sequence A126064 A126065 A126066
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KEYWORD
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nonn,tabl,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Feb 28 2007
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 23 2007
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