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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 27 |
| 3 | 2890 |
| 4 | 705740 |
| 5 | 310181886 |
| 6 | 215071984512 |
| 7 | 216357598418676 |
| 8 | 298018065222408960 |
| 9 | 538758820820128412790 |
| 10 | 1237604585414359892787200 |
| 11 | 3521561770316172974098259916 |
| 12 | 12159265179096745219044911480832 |
| 13 | 50086112147669900240287215353718700 |
| 14 | 242646275221231775443338250567758643200 |
[1,1,27,2890,705740,310181886,215071984512, 216357598418676,298018065222408960, 538758820820128412790,1237604585414359892787200, 3521561770316172974098259916, 12159265179096745219044911480832, 50086112147669900240287215353718700, 242646275221231775443338250567758643200] |