A026888 T(2n+1,n+2), T given by A026769.
1, 5, 22, 95, 413, 1823, 8196, 37568, 175542, 835526, 4046264, 19909703, 99391155, 502637329, 2571355930, 13288938738, 69296856372, 364220714252, 1927675740374, 10265166063864, 54960921754824, 295688640900428
Offset: 1