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