The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 256 |
| 2 | 1460 |
| 3 | 8291 |
| 4 | 50268 |
| 5 | 303996 |
| 6 | 1843152 |
| 7 | 11184876 |
| 8 | 68097912 |
| 9 | 414486896 |
| 10 | 2520029560 |
| 11 | 15323465712 |
| 12 | 93248017968 |
| 13 | 567415341640 |
| 14 | 3451194769584 |
| 15 | 20991971640784 |
| 16 | 127717262497696 |
| 17 | 777044322795552 |
| 18 | 4726792218081184 |
[256,1460,8291,50268,303996,1843152,11184876, 68097912,414486896,2520029560,15323465712, 93248017968,567415341640,3451194769584, 20991971640784,127717262497696,777044322795552, 4726792218081184] |