The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 45 |
| 3 | 250 |
| 4 | 1 |
| 5 | 9286 |
| 6 | 35411 |
| 7 | 794376 |
| 8 | 72865 |
| 9 | 34403018 |
| 10 | 9885773 |
| 11 | 1500022495 |
| 12 | 1 |
| 13 | 28700208851 |
| 14 | 1 |
| 15 | 2352056093102 |
| 16 | 1 |
| 17 | 102340463411217 |
| 18 | 1 |
| 19 | 3123368686057682 |
| 20 | 1 |
| 21 | 132116164569671440 |
| 22 | 402070508232683666 |
| 23 | 5528252581301500133 |
[1,6,45,250,1,9286,35411,794376,72865,34403018, 9885773,1500022495,1,28700208851,1,2352056093102, 1,102340463411217,1,3123368686057682,1, 132116164569671440,402070508232683666, 5528252581301500133] |