A116869 - OEIS

A116869

Sixth column of triangle A028364.

132, 297, 869, 2739, 8986, 30275, 104006, 362738, 1280592, 4566642, 16423581, 59497075, 216901454, 795117015, 2929034130, 10837075830, 40253156520, 150045410430, 561097823490, 2104382963214, 7913603390196

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OFFSET

0,1

COMMENTS

Also sixth diagonal of triangle A067323.

LINKS

Table of n, a(n) for n=0..20.

FORMULA

a(n)= A028364(n+5,5) = sum(C(k)*C(n+5-k),k=0..5), with the Catalan numbers C(n):=A000108(n).

G.f.: (c5(x)*c(x)-(c5(x)-1)/x)/x^5, with c5(x) := sum(C(k)*x^k, k=0..5) and c(x) is the g.f. for the Catalan numbers A000108.

CROSSREFS

Cf. A067296 (fifth column).

Sequence in context: A319274 A241754 A063365 * A035141 A205222 A116154

Adjacent sequences: A116866 A116867 A116868 * A116870 A116871 A116872

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang, Mar 24 2006

STATUS

approved