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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 63 |
| 4 | 924 |
| 5 | 17226 |
| 6 | 387567 |
| 7 | 10182744 |
| 8 | 305379129 |
| 9 | 10280074116 |
| 10 | 383492465902 |
| 11 | 15692864353299 |
| 12 | 698622377024472 |
| 13 | 33604795914668178 |
| 14 | 1736477536255603281 |
| 15 | 95918139377302294980 |
| 16 | 5639487915973132301793 |
| 17 | 351611645300506492405623 |
[1,1,6,63,924,17226,387567,10182744,305379129, 10280074116,383492465902,15692864353299, 698622377024472,33604795914668178, 1736477536255603281,95918139377302294980, 5639487915973132301793,351611645300506492405623] |