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
Offset: 0