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A055867 Fourth column of triangle A055864. 3
0, 0, 0, 64, 750, 10584, 175616, 3359232, 72900000, 1771561000, 47692136448, 1409582685888, 45392319784448, 1582328671875000, 59373627899904000, 2386420683693101056, 102303226385042448384, 4659806991485780193672 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..18.

FORMULA

a(i)=0 for i=1, 2, 3; a(n) = n^3*(n+1)^(n-4), n >= 4.

E.g.f.: (9*W(-x)^2-14*W(-x)^3+3*W(-x)^4-9*x^2-32*x^3-81*x^4)/(72*x), W(x) principal branch of Lambert's function.

MAPLE

A055867:=n->n^3*(n+1)^(n-4): 0, 0, 0, seq(A055867(n), n=4..30); # Wesley Ivan Hurt, Jan 27 2017

CROSSREFS

a(n)=A055864(n, 4). Cf. A000272, A055865, A055070, A055866, A055858.

Sequence in context: A108538 A195593 A221753 * A304346 A316217 A305641

Adjacent sequences:  A055864 A055865 A055866 * A055868 A055869 A055870

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang, Jun 20 2000

STATUS

approved

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Last modified February 20 18:08 EST 2020. Contains 332082 sequences. (Running on oeis4.)