The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 37 |
| 5 | 167 |
| 6 | 924 |
| 7 | 6131 |
| 8 | 47375 |
| 9 | 416386 |
| 10 | 4092561 |
| 11 | 44425747 |
| 12 | 527519908 |
| 13 | 6798966455 |
| 14 | 94504777563 |
| 15 | 1408978112018 |
| 16 | 22426272777581 |
| 17 | 379522678985599 |
| 18 | 6804322657491180 |
| 19 | 128828945745308779 |
| 20 | 2568535276579439959 |
| 21 | 53788306394034188738 |
| 22 | 1180357569448221308697 |
[0,1,3,10,37,167,924,6131,47375,416386,4092561, 44425747,527519908,6798966455,94504777563, 1408978112018,22426272777581,379522678985599, 6804322657491180,128828945745308779, 2568535276579439959,53788306394034188738, 1180357569448221308697] |