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

Author

Paul D. Hanna, May 02 2006

Keywords

• nonn

Comments

Self-convolution of A118803.

Crossrefs

Cf. A118801, A118803.

Programs

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)}