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A154322 a(n)=1+n+C(n+3,5) 1
1, 2, 4, 10, 26, 62, 133, 260, 471, 802, 1298, 2014, 3016, 4382, 6203, 8584, 11645, 15522, 20368, 26354, 33670, 42526, 53153, 65804, 80755, 98306, 118782, 142534, 169940, 201406, 237367, 278288, 324665, 377026, 435932 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

COMMENTS

Row sums of number triangle A113582.

FORMULA

G.f.: (1-4x+7x^2-4x^3+x^4)/(1-x)^6;

a(n)=(n+1)+sum{k=0..n, C(k+1,2)*C(n-k+1,2)}=(n+1)(n^4+4n^3+n^2-6n+120)/120;

CROSSREFS

Sequence in context: A007021 A100605 A183947 * A090031 A055775 A090032

Adjacent sequences:  A154319 A154320 A154321 * A154323 A154324 A154325

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Jan 07 2009

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Last modified February 17 20:50 EST 2012. Contains 206085 sequences.