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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 52 |
| 4 | 8925 |
| 5 | 22661496 |
| 6 | 1131162092095 |
| 7 | 1375009641495014400 |
| 8 | 48378633136349277767794425 |
| 9 | 57001313848230245122464621625840000 |
| 10 | 2552524038347870310755413660544832496799359491 |
| 11 | 4859161865915056755501262525796512204608930674134393036800 |
[1,1,3,52,8925,22661496,1131162092095, 1375009641495014400,48378633136349277767794425, 57001313848230245122464621625840000, 2552524038347870310755413660544832496799359491, 48591618659150567555012625257965122046089306741343\ 93036800] |