A091753 Fourth column (m=5) of array A091752 ((-1,2)Stirling2) divided by -6.

1, 60, 6720, 1232000, 336336000, 128076748800, 64892219392000, 42217023873024000, 34301331896832000000, 34042166278055936000000, 40523794737397786214400000, 56991191326140341157888000000

Offset

3,2

Links

Table of n, a(n) for n=3..14.

Formula

a(n)= -A091752(n, 5)/6, n>=3.

a(n)=((n-1)*(n-2)/4)*(3*(n-2))!/((3^(n-2))*(n-2)!) = ((n-1)*(n-2)/4)*A052502(n-2), n>=3.

G.f.: (x^3)*hypergeom([4/3, 5/3, 3], [], 9*x).

Crossrefs

Sequence in context: A091032 A328951 A178785 * A336629 A303790 A327678

Adjacent sequences: A091750 A091751 A091752 * A091754 A091755 A091756

Keyword

nonn,easy

Author

Wolfdieter Lang, Feb 27 2004

Status

approved