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A136661
Unsigned fifth column (k=4) of triangle A136656 divided by 16.
2
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.
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
KEYWORD
nonn,easy
AUTHOR
Wolfdieter Lang, Feb 22 2008
STATUS
approved