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A116384 Diagonal sums of the Riordan array A116382. 1
1, 0, 3, 1, 10, 6, 36, 28, 135, 121, 517, 507, 2003, 2093, 7815, 8569, 30634, 34902, 120480, 141664, 475002, 573574, 1876294, 2318010, 7422676, 9354540, 29400192, 37708672, 116567356, 151868100, 462561572, 611180252, 1836843591, 2458123705 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

FORMULA

a(n)=sum{k=0..floor(n/2), sum{j=0..n-k, (-1)^(n-k-j)*C(n-k,j)*sum{i=0..j, C(j,i-k)C(i,j-i)}}}.

CROSSREFS

Sequence in context: A091965 A171568 A107056 * A117207 A046658 A124574

Adjacent sequences:  A116381 A116382 A116383 * A116385 A116386 A116387

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Feb 12 2006

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Last modified February 16 19:23 EST 2012. Contains 205945 sequences.