The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 7 |
| 7 | 23 |
| 8 | 59 |
| 9 | 314 |
| 10 | 1529 |
| 11 | 8209 |
| 12 | 83313 |
| 13 | 620297 |
| 14 | 7869898 |
| 15 | 126742987 |
| 16 | 1687054711 |
| 17 | 47301104551 |
| 18 | 1123424582771 |
| 19 | 32606721084786 |
| 20 | 1662315215971057 |
| 21 | 61958046554226593 |
| 22 | 4257998884448335457 |
| 23 | 334806306946199122193 |
| 24 | 23385756731869683322514 |
| 25 | 3416372868727801226636179 |
[1,1,1,1,2,3,7,23,59,314,1529,8209,83313,620297, 7869898,126742987,1687054711,47301104551, 1123424582771,32606721084786,1662315215971057, 61958046554226593,4257998884448335457, 334806306946199122193,23385756731869683322514, 3416372868727801226636179] |