A027279 a(n) = Sum_{k=0..2n-2} T(n,k) * T(n,k+2), with T given by A026568.

7, 44, 273, 1696, 10573, 66151, 415277, 2615004, 16512355, 104526093, 663143211, 4215574482, 26846320149, 171243444982, 1093897673897, 6997031842554, 44809862773473, 287283383574927, 1843675415666053, 11842954734864350, 76138777668602115, 489884818519692190

Offset: 2

Author

Clark Kimberling

Keywords

• nonn

Extensions

More terms from Sean A. Irvine, Oct 26 2019