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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 40 |
| 6 | 52 |
| 7 | 82 |
| 8 | 4839 |
| 9 | 5813 |
| 10 | 8366 |
| 11 | 11153 |
| 12 | 46254 |
| 13 | 1040968 |
| 14 | 12925493 |
[0,1,2,4,40,52,82,4839,5813,8366,11153,46254, 1040968,12925493] |