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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 10 |
| 4 | 44 |
| 5 | 341 |
| 6 | 1495 |
| 7 | 11584 |
| 8 | 50786 |
| 9 | 393515 |
| 10 | 1725229 |
| 11 | 13367926 |
| 12 | 58607000 |
| 13 | 454115969 |
| 14 | 1990912771 |
| 15 | 15426575020 |
| 16 | 67632427214 |
| 17 | 524049434711 |
| 18 | 2297511612505 |
| 19 | 17802254205154 |
| 20 | 78047762397956 |
| 21 | 604752593540525 |
| 22 | 2651326409917999 |
| 23 | 20543785926172696 |
| 24 | 90067050174814010 |
[0,1,10,44,341,1495,11584,50786,393515,1725229, 13367926,58607000,454115969,1990912771, 15426575020,67632427214,524049434711, 2297511612505,17802254205154,78047762397956, 604752593540525,2651326409917999, 20543785926172696,90067050174814010] |