The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 37 |
| 4 | 193 |
| 5 | 1515 |
| 6 | 8719 |
| 7 | 52291 |
| 8 | 334317 |
| 9 | 2067173 |
| 10 | 12663609 |
| 11 | 78727511 |
| 12 | 488078559 |
| 13 | 3014804713 |
| 14 | 18665197193 |
| 15 | 115593457951 |
| 16 | 715253390987 |
| 17 | 4426801402571 |
| 18 | 27403189146691 |
| 19 | 169608418907807 |
| 20 | 1049766166947791 |
| 21 | 6497692031157569 |
[1,7,37,193,1515,8719,52291,334317,2067173, 12663609,78727511,488078559,3014804713, 18665197193,115593457951,715253390987, 4426801402571,27403189146691,169608418907807, 1049766166947791,6497692031157569] |