A118802 Row squared sums of triangle A118801: a(n) = Sum_{k=0..n} A118801(n,k)^2.

1, 2, 11, 76, 565, 4406, 35455, 291264, 2427113, 20436202, 173435251, 1481052596, 12711044125, 109543953182, 947334302951, 8216780507176, 71450654876625, 622692860482514, 5437356743763163, 47561030194674972, 416661242790844421

Offset

0,2

Comments

Self-convolution of A118803.

Links

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

Prog

(PARI) {a(n)=sum(k=0, n, (1+(-1)^k*2^(n-k+1)*sum(j=0, k\2, binomial(n-2*j-2, k-2*j-1)))^2)}

Crossrefs

Cf. A118801, A118803.

Sequence in context: A354298 A350580 A209101 * A365146 A350680 A349408

Adjacent sequences: A118799 A118800 A118801 * A118803 A118804 A118805

Keyword

nonn

Author

Paul D. Hanna, May 02 2006

Status

approved