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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 16650 |
| 4 | 24928779600 |
| 5 | 111827645954579880000 |
| 6 | 3822731887490658669088662984000000 |
| 7 | 2132112202139633769017736141415928803125840000000000 |
[1,10,16650,24928779600,111827645954579880000, 3822731887490658669088662984000000, 21321122021396337690177361414159288031258400000000\ 00] |