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Search: id:A144637
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| 0, 0, 1, -3, 11, -45, 175, -315, -6265, 139755, -2127125, 28153125, -327452125, 2921393475, -2998820825, -788463550875, 28464750689375, -739460838241125, 16173782241491875, -294957734383186875, 3672958879661946875
(list; graph; listen)
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OFFSET
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0,4
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FORMULA
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E.g.f.: B(x)^2/2 where B(x) is e.g.f. for A144636. [From Vladeta Jovovic (vladeta(AT)eunet.yu), Jan 24 2009]
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MAPLE
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A:= proc(n, k) option remember; if n=k then 1 elif k<n or n<1 then 0 else A(n-1, k-1) +(k-1) *A(n-1, k-2) +(k-1) *(k-2) *A(n-1, k-3)/2 fi end: M:= proc(n) option remember; Matrix(n+1, (i, j)-> A(i-1, j-1))^(-1) end: a:= n-> M (n+2)[3, n+1]: seq (a(n), n=0..25); [From Alois P. Heinz (heinz(AT)hs-heilbronn.de), Oct 25 2009]
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CROSSREFS
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Sequence in context: A030844 A030959 A073590 this_sequence A151109 A151110 A151111
Adjacent sequences: A144634 A144635 A144636 this_sequence A144638 A144639 A144640
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KEYWORD
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sign
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Jan 23 2009
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EXTENSIONS
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More terms from Alois P. Heinz (heinz(AT)hs-heilbronn.de), Oct 25 2009
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