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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 41 |
| 2 | 1640 |
| 3 | 64780 |
| 4 | 2558400 |
| 5 | 101024820 |
| 6 | 3989217180 |
| 7 | 157523886000 |
| 8 | 6220211664420 |
| 9 | 245620097065980 |
| 10 | 9698903409405600 |
| 11 | 382984651654144020 |
| 12 | 15123074971766970780 |
| 13 | 597171180654087109200 |
| 14 | 23580747941118076783620 |
[1,41,1640,64780,2558400,101024820,3989217180, 157523886000,6220211664420,245620097065980, 9698903409405600,382984651654144020, 15123074971766970780,597171180654087109200, 23580747941118076783620] |