A026654 a(n) = T(n,[ n/2 ]), T given by A026648.
1, 1, 3, 4, 8, 14, 36, 57, 114, 222, 558, 928, 1856, 3764, 9384, 15971, 31942, 66190, 164322, 283464, 566928, 1190628, 2948184, 5131002, 10262004, 21749532, 53761068, 94153056, 188306112, 401757672, 991821456, 1745117091
Offset: 0