The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 256 |
| 2 | 1776 |
| 3 | 12712 |
| 4 | 91440 |
| 5 | 656272 |
| 6 | 4711264 |
| 7 | 33827496 |
| 8 | 242859696 |
| 9 | 1743558448 |
| 10 | 12517828752 |
| 11 | 89871316488 |
| 12 | 645223555056 |
| 13 | 4632334222640 |
| 14 | 33257550378496 |
| 15 | 238770342344520 |
| 16 | 1714234994048944 |
| 17 | 12307232871040912 |
| 18 | 88358941969931504 |
[256,1776,12712,91440,656272,4711264,33827496, 242859696,1743558448,12517828752,89871316488, 645223555056,4632334222640,33257550378496, 238770342344520,1714234994048944, 12307232871040912,88358941969931504] |