A026901 T(2n+1,n+4), T given by A026780.
1, 10, 68, 396, 2136, 11062, 56070, 281306, 1406721, 7042818, 35401568, 178975192, 910933936, 4669860386, 24114746282, 125416122430, 656713729000, 3460748531510, 18345703137458, 97782896293158, 523786141723670
Offset: 3