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Search: id:A145143
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| 1, 1, 2, 6, 144, 1200, 9960, 89040, 1231776, 18325440, 280100160, 4415368320, 78497147520, 1538731434240, 32250825734400, 708789321676800, 16531867860480000, 410557135229337600, 10800330695046144000
(list; graph; listen)
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OFFSET
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2,3
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MAPLE
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row:= proc(n) option remember; local f, i, x; f:= unapply (simplify (sum ('cat (a||i) *x^i', 'i'=0..n-1) ), x); unapply (subs (solve ({seq(f(i+1)= coeftayl (x/ (1-x-x^4)/ (1-x)^i, x=0, n), i=0..n-1)}, {seq (cat (a||i), i=0..n-1)}), sum ('cat (a||i) *x^i', 'i'=0..n-1) ), x); end: a:= n-> `if` (n=0, 0, coeftayl (row(n)(x), x=0, 1) *(n-1)!): seq (a(n), n=2..23);
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CROSSREFS
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Cf. A145153.
Sequence in context: A159478 A047937 A027731 this_sequence A164764 A024397 A015173
Adjacent sequences: A145140 A145141 A145142 this_sequence A145144 A145145 A145146
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KEYWORD
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nonn
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AUTHOR
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Alois P. Heinz (heinz(AT)hs-heilbronn.de), Oct 03 2008
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