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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 10 |
| 3 | 115 |
| 4 | 1666 |
| 5 | 30198 |
| 6 | 665148 |
| 7 | 17296851 |
| 8 | 518916970 |
| 9 | 17643220738 |
| 10 | 670442556004 |
| 11 | 28158587998814 |
| 12 | 1295295050441588 |
| 13 | 64764752531737100 |
| 14 | 3497296636751245560 |
| 15 | 202843204931717665155 |
| 16 | 12576278705767060962330 |
[0,1,10,115,1666,30198,665148,17296851,518916970, 17643220738,670442556004,28158587998814, 1295295050441588,64764752531737100, 3497296636751245560,202843204931717665155, 12576278705767060962330] |