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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 15 |
| 4 | 97 |
| 5 | 733 |
| 6 | 6147 |
| 7 | 55541 |
| 8 | 530773 |
| 9 | 5298723 |
| 10 | 54780831 |
| 11 | 582817337 |
| 12 | 6350647873 |
| 13 | 70614662303 |
| 14 | 798935833885 |
| 15 | 9176290300419 |
| 16 | 106793746090045 |
| 17 | 1257408517909283 |
| 18 | 14958873368871405 |
| 19 | 179614516459970349 |
| 20 | 2174717049372338913 |
| 21 | 26530091641879493297 |
| 22 | 325875790867387681293 |
[1,1,3,15,97,733,6147,55541,530773,5298723, 54780831,582817337,6350647873,70614662303, 798935833885,9176290300419,106793746090045, 1257408517909283,14958873368871405, 179614516459970349,2174717049372338913, 26530091641879493297,325875790867387681293] |