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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 22 |
| 5 | 342 |
| 6 | 1444 |
| 7 | 33184 |
| 8 | 399235 |
| 9 | 12502550 |
| 10 | 117906198 |
| 11 | 7740054144 |
| 12 | 74673569118 |
| 13 | 4724493959332 |
| 14 | 121637216075836 |
| 15 | 4503600768557056 |
| 16 | 89450720590507768 |
| 17 | 10119960926575526448 |
| 18 | 152232968281237988010 |
| 19 | 16384000020089600480000 |
| 20 | 552020693349464673399080 |
| 21 | 35271474934322858202723576 |
[1,2,6,22,342,1444,33184,399235,12502550, 117906198,7740054144,74673569118,4724493959332, 121637216075836,4503600768557056, 89450720590507768,10119960926575526448, 152232968281237988010,16384000020089600480000, 552020693349464673399080, 35271474934322858202723576] |