A027303 a(n) = Sum_{k=0..floor((n-3)/2)} T(n,k) * T(n,k+2), with T given by A008315.

2, 5, 34, 98, 496, 1545, 7010, 22924, 98636, 333463, 1393014, 4824350, 19795200, 69818507, 283195638, 1013208668, 4078132240, 14758843463, 59087809638, 215859015800, 860951003152, 3169965920150, 12609168181324, 46735070397768, 185532421441976, 691582241867227

Offset

3,1

Links

Table of n, a(n) for n=3..28.

Crossrefs

Sequence in context: A114793 A254429 A298945 * A357446 A371615 A356772

Adjacent sequences: A027300 A027301 A027302 * A027304 A027305 A027306

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 26 2019

Status

approved