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

0,2

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.

Links

Table of n, a(n) for n=0..15.

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).

Crossrefs

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

Sequence in context: A001777 A205828 A353115 * A264849 A111779 A075473

Adjacent sequences: A136658 A136659 A136660 * A136662 A136663 A136664

Keyword

nonn,easy

Author

Wolfdieter Lang, Feb 22 2008

Status

approved