The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 256 |
| 2 | 1416 |
| 3 | 8238 |
| 4 | 50998 |
| 5 | 324760 |
| 6 | 2135910 |
| 7 | 14272968 |
| 8 | 97077068 |
| 9 | 665750830 |
| 10 | 4607875290 |
| 11 | 32019860020 |
| 12 | 223534827494 |
| 13 | 1563373657868 |
| 14 | 10959098528264 |
| 15 | 76884218567414 |
| 16 | 539997393805814 |
| 17 | 3793994100382864 |
| 18 | 26671435372462390 |
[256,1416,8238,50998,324760,2135910,14272968, 97077068,665750830,4607875290,32019860020, 223534827494,1563373657868,10959098528264, 76884218567414,539997393805814,3793994100382864, 26671435372462390] |