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A144638 Column 3 of triangle in A144633. 1
0, 0, 0, 1, -6, 35, -210, 1225, -5670, -5005, 750750, -16391375, 278528250, -4130451325, 51941839950, -429736682375, -3328691115750, 297526876521875, -10250866397021250, 276000929009430625, -6284336658393543750, 114982352685697371875, -1137436827419674031250 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,5
LINKS
FORMULA
E.g.f.: B(x)^3/6 where B(x) is e.g.f. for A144636. [From Vladeta Jovovic, Jan 24 2009]
MAPLE
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+3)[4, n+1]: seq (a(n), n=0..25); # Alois P. Heinz, Oct 25 2009
MATHEMATICA
max = 22; t[n_, n_] = 1; t[n_ /; n >= 0, k_] /; (0 <= k <= 3*n) := t[n, k] = t[n-1, k-1] + (k-1)*t[n-1, k-2] + (1/2)*(k-1)*(k-2)*t[n-1, k-3]; t[_, _] = 0; A144633 = Table[t[n, k], {n, 0, max}, {k, 0, max}] // Inverse // Transpose ; A144633[[All, 4]] (* Jean-François Alcover, Jan 17 2014 *)
CROSSREFS
Sequence in context: A354134 A260770 A262717 * A291246 A117671 A354136
KEYWORD
sign
AUTHOR
N. J. A. Sloane, Jan 23 2009
EXTENSIONS
More terms from Alois P. Heinz, Oct 25 2009
STATUS
approved

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)