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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 15 |
| 4 | 93 |
| 5 | 620 |
| 6 | 4046 |
| 7 | 24077 |
| 8 | 138709 |
| 9 | 1448110 |
| 10 | 32196907 |
| 11 | 697062429 |
| 12 | 11628586799 |
| 13 | 140701747704 |
| 14 | 1213958140794 |
| 15 | 21010393015426 |
| 16 | 1219119257782371 |
| 17 | 56771570322826701 |
| 18 | 1958328935823726853 |
| 19 | 55307040650361330286 |
| 20 | 1429761229872782798864 |
| 21 | 40335112020127634181504 |
| 22 | 1453061157501054116976825 |
| 23 | 63044483568580391515906296 |
[1,1,3,15,93,620,4046,24077,138709,1448110, 32196907,697062429,11628586799,140701747704, 1213958140794,21010393015426,1219119257782371, 56771570322826701,1958328935823726853, 55307040650361330286,1429761229872782798864, 40335112020127634181504,1453061157501054116976825, 63044483568580391515906296] |