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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
OFFSET
0,2
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: A369599 A208237 A321958 * A193318 A171450 A204190
KEYWORD
easy,nonn
AUTHOR
Paul Barry, May 12 2005
STATUS
approved