The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 25 |
| 3 | 328 |
| 4 | 4394 |
| 5 | 59883 |
| 6 | 826952 |
| 7 | 11535925 |
| 8 | 162202029 |
| 9 | 2295079168 |
| 10 | 32641265307 |
| 11 | 466210121163 |
| 12 | 6682645676656 |
| 13 | 96081057775690 |
| 14 | 1385055494381483 |
| 15 | 20011937622661306 |
| 16 | 289722936844910404 |
| 17 | 4201924638932790618 |
| 18 | 61038153035664510382 |
| 19 | 887914762634986995965 |
| 20 | 12932943216967486046109 |
[1,2,25,328,4394,59883,826952,11535925,162202029, 2295079168,32641265307,466210121163,6682645676656, 96081057775690,1385055494381483,20011937622661306, 289722936844910404,4201924638932790618, 61038153035664510382,887914762634986995965, 12932943216967486046109] |