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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 23 |
| 3 | 632 |
| 4 | 20592 |
| 5 | 734400 |
| 6 | 27705984 |
| 7 | 1086831962 |
| 8 | 43880429586 |
| 9 | 1811403496610 |
| 10 | 76104309064345 |
| 11 | 3243585449869690 |
| 12 | 139894941451780572 |
| 13 | 6094362820563358094 |
| 14 | 267775378869795256077 |
| 15 | 11852898175993602480090 |
| 16 | 528058236407010277514014 |
[1,23,632,20592,734400,27705984,1086831962, 43880429586,1811403496610,76104309064345, 3243585449869690,139894941451780572, 6094362820563358094,267775378869795256077, 11852898175993602480090,528058236407010277514014] |