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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 42 |
| 2 | 6006 |
| 3 | 1085280 |
| 4 | 217567350 |
| 5 | 46262007792 |
| 6 | 10217700004512 |
| 7 | 2317454130543552 |
| 8 | 536022010184210550 |
| 9 | 125863265857621191900 |
| 10 | 29909151834298018538256 |
| 11 | 7176685161839833601969280 |
| 12 | 1735941935586019529116213920 |
| 13 | 422752608090008019258722317800 |
[1,42,6006,1085280,217567350,46262007792, 10217700004512,2317454130543552, 536022010184210550,125863265857621191900, 29909151834298018538256,7176685161839833601969280, 1735941935586019529116213920, 422752608090008019258722317800] |