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| n | a(n) |
|---|---|
| 1 | 1620 |
| 2 | 889056 |
| 3 | 300056400 |
| 4 | 86415197088 |
| 5 | 22984646281176 |
| 6 | 5826856525990272 |
| 7 | 1430390977786967280 |
| 8 | 343122372255163660560 |
| 9 | 80890546793429923552008 |
| 10 | 18813147168685841982033408 |
| 11 | 4328190538478506032118840320 |
[1620,889056,300056400,86415197088,22984646281176, 5826856525990272,1430390977786967280, 343122372255163660560,80890546793429923552008, 18813147168685841982033408, 4328190538478506032118840320] |