A026914 T(n,[ n/2 ]), T given by A026907.
1, 13, 44, 90, 198, 370, 758, 1403, 2824, 5256, 10530, 19749, 39516, 74628, 149274, 283551, 567120, 1082440, 2164898, 4148594, 8297206, 15953598, 31907214, 61526960, 123053938, 237876562, 475753142, 921678867, 1843357752
Offset: 0