A026678 a(n) = T(n,0) + T(n,1) + ... + T(n,[ n/2 ]), T given by A026670.
1, 1, 4, 5, 17, 23, 73, 103, 314, 455, 1350, 1993, 5798, 8679, 24872, 37633, 106573, 162643, 456169, 701075, 1950697, 3015563, 8334539, 12948083, 35582783, 55513327, 151809737, 237705547, 647279131, 1016736115, 2758310121
Offset: 0