A026948 a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026374.

1, 8, 58, 272, 1770, 7428, 46928, 189808, 1185645, 4724160, 29362806, 116207424, 720606705, 2842936320, 17610412600, 69378730880, 429579843435, 1691519468760, 10472653252550, 41235710124400, 255326054688320, 1005560117623204, 6227515552731528, 24534901740913872

Offset

2,2

Links

Table of n, a(n) for n=2..25.

Crossrefs

Sequence in context: A002402 A015464 A144781 * A111585 A055839 A297097

Adjacent sequences: A026945 A026946 A026947 * A026949 A026950 A026951

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 17 2019

Status

approved