The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 511 |
| 3 | 9841 |
| 4 | 130816 |
| 5 | 488281 |
| 6 | 5028751 |
| 7 | 6725601 |
| 8 | 33488896 |
| 9 | 64566801 |
| 10 | 249511591 |
| 11 | 235794769 |
| 12 | 1287360256 |
| 13 | 883708281 |
| 14 | 3436782111 |
| 15 | 4805173321 |
| 16 | 8573157376 |
| 17 | 7411742281 |
| 18 | 32993635311 |
| 19 | 17927094321 |
| 20 | 63874967296 |
| 21 | 66186639441 |
| 22 | 120491126959 |
| 23 | 81870575521 |
| 24 | 329564225536 |
[1,511,9841,130816,488281,5028751,6725601, 33488896,64566801,249511591,235794769,1287360256, 883708281,3436782111,4805173321,8573157376, 7411742281,32993635311,17927094321,63874967296, 66186639441,120491126959,81870575521,329564225536] |