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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 62 |
| 4 | 1246 |
| 5 | 34734 |
| 6 | 1239708 |
| 7 | 53958456 |
| 8 | 2771832656 |
| 9 | 164151829440 |
| 10 | 11010949643640 |
| 11 | 825134834757936 |
| 12 | 68321156113803360 |
| 13 | 6194283782068848816 |
| 14 | 610322188305019432032 |
| 15 | 64936303681095948453120 |
| 16 | 7419917758371561069774336 |
| 17 | 906217650382400588573066880 |
[0,1,5,62,1246,34734,1239708,53958456,2771832656, 164151829440,11010949643640,825134834757936, 68321156113803360,6194283782068848816, 610322188305019432032,64936303681095948453120, 7419917758371561069774336, 906217650382400588573066880] |