A136661 Unsigned fifth column (k=4) of triangle A136656 divided by 16.

1, 30, 645, 12495, 235305, 4452840, 86070600, 1713927600, 35318883600, 754896542400, 16751853518400, 386036370720000, 9235831629024000, 229285008336384000, 5902321642753536000, 157423965566579712000

Offset: 0

Author

Wolfdieter Lang, Feb 22 2008

Keywords

• nonn
• easy

Comments

Also unsigned fourth column of triangle A136657 divided by 8.

References

• Ch. A. Charalambides, Enumerative Combinatorics, Chapman & Hall/CRC, Boca Raton, Florida, 2002, Table 8.3, p. 311, with s=-2, k=4 column/16.

Crossrefs

Cf. A136656, A136660 (column k=3).

Formula

a(n) = |A136656(n+4,4)|/16, n>=0.

E.g.f.: (8+144*x+228*x^2-220*x^3-45*x^4+60*x^5-10*x^6)/(8*(1-x)^12) (derived from the one given for the column k=4 under A136656).