A026953 a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026386.

1, 8, 41, 272, 1168, 7428, 30302, 189808, 759101, 4724160, 18728841, 116207424, 458829051, 2842936320, 11203933255, 69378730880, 273211969075, 1691519468760, 6660034471595, 41235710124400, 162381981186970, 1005560117623204, 3961069262796800, 24534901740913872

Offset: 2

Author

Clark Kimberling

Keywords

• nonn

Extensions

More terms from Sean A. Irvine, Oct 17 2019