The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 11 |
| 4 | 59 |
| 5 | 416 |
| 6 | 3683 |
| 7 | 39093 |
| 8 | 484220 |
| 9 | 6854176 |
| 10 | 109150227 |
| 11 | 1931303809 |
| 12 | 37589753206 |
| 13 | 798135918850 |
| 14 | 18358887315769 |
| 15 | 454779141016707 |
| 16 | 12070296596154136 |
| 17 | 341715021307029876 |
| 18 | 10278722402921420619 |
| 19 | 327369178071821161755 |
| 20 | 11005696560250745851048 |
| 21 | 389469699942038630639524 |
[1,3,11,59,416,3683,39093,484220,6854176, 109150227,1931303809,37589753206,798135918850, 18358887315769,454779141016707,12070296596154136, 341715021307029876,10278722402921420619, 327369178071821161755,11005696560250745851048, 389469699942038630639524] |