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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 492 |
| 2 | 707220 |
| 3 | 1298204880 |
| 4 | 2654173160100 |
| 5 | 5765723073622512 |
| 6 | 13021894087331233104 |
| 7 | 30217387890886676251200 |
| 8 | 71532102917478013611243300 |
| 9 | 171944976047709681477985038000 |
| 10 | 418347201888204996027087975427920 |
[1,492,707220,1298204880,2654173160100, 5765723073622512,13021894087331233104, 30217387890886676251200, 71532102917478013611243300, 171944976047709681477985038000, 418347201888204996027087975427920] |