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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 126 |
| 4 | 15755 |
| 5 | 9847001 |
| 6 | 30771893880 |
| 7 | 480810851722001 |
| 8 | 37563347821553222005 |
| 9 | 14673182743275038197425126 |
| 10 | 28658560045496622327167502440755 |
| 11 | 279868750444317625596488416061195472001 |
| 12 | 13665466330288975220888581437110387323801268880 |
[0,1,5,126,15755,9847001,30771893880, 480810851722001,37563347821553222005, 14673182743275038197425126, 28658560045496622327167502440755, 279868750444317625596488416061195472001, 13665466330288975220888581437110387323801268880] |