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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 27 |
| 4 | 115 |
| 5 | 504 |
| 6 | 2265 |
| 7 | 10338 |
| 8 | 47813 |
| 9 | 223114 |
| 10 | 1050079 |
| 11 | 4971631 |
| 12 | 23668103 |
| 13 | 113156814 |
| 14 | 543034247 |
| 15 | 2614185185 |
| 16 | 12619036497 |
| 17 | 61058203462 |
| 18 | 296045810619 |
| 19 | 1438033070515 |
| 20 | 6996549332809 |
| 21 | 34090215523542 |
| 22 | 166319453922703 |
| 23 | 812397626973284 |
| 24 | 3972461977613785 |
| 25 | 19443521682536228 |
| 26 | 95252946562640577 |
[1,2,7,27,115,504,2265,10338,47813,223114,1050079, 4971631,23668103,113156814,543034247,2614185185, 12619036497,61058203462,296045810619, 1438033070515,6996549332809,34090215523542, 166319453922703,812397626973284,3972461977613785, 19443521682536228,95252946562640577] |