A091756 Seventh column (m=8) of array A091752 ((-1,2)Stirling2).

1, 220, 48720, 14463680, 5762556800, 3000655257600, 1987324218880000, 1634736979972096000, 1636859558116823040000, 1961447726093804748800000, 2772502956616965206835200000, 4565871212782705024303104000000

Offset

4,2

Links

Table of n, a(n) for n=4..15.

Formula

a(n)= A091752(n, 8), n>=4.

a(n)= (9/6!)*(n-3)*(9*n^3-45*n^2+36*n+40)*(3*(n-3))!/((3^(n-3))*(n-3)!)= (9/6!)*(n-3)*(9*n^3-45*n^2+36*n+40)*A052502(n-3), n>=4.

Crossrefs

Sequence in context: A140918 A049023 A282591 * A167825 A339680 A266237

Adjacent sequences: A091753 A091754 A091755 * A091757 A091758 A091759

Keyword

nonn,easy

Author

Wolfdieter Lang, Feb 27 2004

Status

approved