The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 256 |
| 2 | 1810 |
| 3 | 12981 |
| 4 | 94458 |
| 5 | 687254 |
| 6 | 4977790 |
| 7 | 36125717 |
| 8 | 262009080 |
| 9 | 1902689356 |
| 10 | 13793932488 |
| 11 | 100152908224 |
| 12 | 726176038552 |
| 13 | 5272782009672 |
| 14 | 38229547221928 |
| 15 | 277581361120444 |
| 16 | 2012592670155936 |
| 17 | 14613326239922048 |
| 18 | 105952842547441728 |
[256,1810,12981,94458,687254,4977790,36125717, 262009080,1902689356,13793932488,100152908224, 726176038552,5272782009672,38229547221928, 277581361120444,2012592670155936, 14613326239922048,105952842547441728] |