A026656 a(n) = T(n,0) + T(n,1) + ... + T(n,[ n/2 ]), T given by A026648.

1, 1, 4, 5, 15, 22, 67, 98, 275, 436, 1249, 1940, 5244, 8632, 23896, 38408, 101419, 170896, 462361, 760400, 1975160, 3383392, 9001276, 15054368, 38623130, 66984256, 175903414, 298045760, 757228832, 1326151552, 3446259592