The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 8 |
| 3 | 49 |
| 4 | 288 |
| 5 | 1681 |
| 6 | 9800 |
| 7 | 57121 |
| 8 | 332928 |
| 9 | 1940449 |
| 10 | 11309768 |
| 11 | 65918161 |
| 12 | 384199200 |
| 13 | 2239277041 |
| 14 | 13051463048 |
| 15 | 76069501249 |
| 16 | 443365544448 |
| 17 | 2584123765441 |
| 18 | 15061377048200 |
| 19 | 87784138523761 |
| 20 | 511643454094368 |
| 21 | 2982076586042449 |
| 22 | 17380816062160328 |
| 23 | 101302819786919521 |
[0,1,8,49,288,1681,9800,57121,332928,1940449, 11309768,65918161,384199200,2239277041, 13051463048,76069501249,443365544448, 2584123765441,15061377048200,87784138523761, 511643454094368,2982076586042449, 17380816062160328,101302819786919521] |