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

Author

Clark Kimberling

Keywords

• nonn

Extensions

More terms from Sean A. Irvine, Oct 17 2019