A026711 a(n) = T(n,0) + T(n,1) + ... + T(n,[ n/2 ]), T given by A026703.

1, 1, 4, 6, 20, 32, 101, 165, 507, 837, 2531, 4205, 12583, 20993, 62368, 104354, 308438, 517146, 1522818, 2557110, 7508968, 12623188, 36990948, 62237324, 182092022, 306566670, 895859156, 1508992496, 4405521688, 7423506680