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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 8 |
| 4 | 92 |
| 5 | 1298 |
| 6 | 20988 |
| 7 | 375120 |
| 8 | 7252065 |
| 9 | 149534312 |
| 10 | 3256987724 |
| 11 | 74418884792 |
| 12 | 1774657501252 |
| 13 | 43995940957120 |
| 14 | 1130453689908568 |
| 15 | 30031716838365552 |
| 16 | 823263454676130312 |
| 17 | 23249951990747403528 |
| 18 | 675517165191231019920 |
| 19 | 20168579968950108809736 |
| 20 | 618158189347428262782816 |
| 21 | 19432224179107494743506272 |
| 22 | 626034612821085407187912624 |
[1,1,8,92,1298,20988,375120,7252065,149534312, 3256987724,74418884792,1774657501252, 43995940957120,1130453689908568,30031716838365552, 823263454676130312,23249951990747403528, 675517165191231019920,20168579968950108809736, 618158189347428262782816, 19432224179107494743506272, 626034612821085407187912624] |