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A107112 Row sums of A107111, viewed as a number triangle. 1
1, 2, 5, 15, 54, 228, 1106, 6069, 37212, 252287, 1873928, 15127191, 131788320, 1231650843, 12283477562, 130137706957, 1458823402224, 17242265101407, 214202486482516, 2789239633559763, 37974772474452740, 539356744121554370 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..21.

FORMULA

a(n)=sum{k=0..n, sum{j=0..k, binomial((n-k)(k+1), k-j)*binomial(k+j, j)}/(k+1)}

CROSSREFS

Sequence in context: A185040 A208237 A321958 * A193318 A171450 A204190

Adjacent sequences:  A107109 A107110 A107111 * A107113 A107114 A107115

KEYWORD

easy,nonn

AUTHOR

Paul Barry, May 12 2005

STATUS

approved

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Last modified April 24 19:49 EDT 2019. Contains 322446 sequences. (Running on oeis4.)