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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 264 |
| 3 | 1015440 |
| 4 | 90449251200 |
| 5 | 169107043478365440 |
| 6 | 6267416821165079203599360 |
| 7 | 4435711276305905572695127676467200 |
| 8 | 58393052751308545653929138771580386824519680 |
| 9 | 14021772793551297695593332913856884153315254190271692800 |
| 10 | 60498832138791357698014788383803842810832836262245623803123983974400 |
[2,264,1015440,90449251200,169107043478365440, 6267416821165079203599360, 4435711276305905572695127676467200, 58393052751308545653929138771580386824519680, 14021772793551297695593332913856884153315254190271\ 692800, 60498832138791357698014788383803842810832836262245\ 623803123983974400] |