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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 70 |
| 4 | 2100 |
| 5 | 23100 |
| 6 | 1051050 |
| 7 | 14294280 |
| 8 | 814773960 |
| 9 | 12547518984 |
| 10 | 824551247520 |
| 11 | 13781785137120 |
| 12 | 999179422441200 |
| 13 | 17699749768958400 |
| 14 | 1379105502831342000 |
| 15 | 25513451802379827000 |
| 16 | 2100607531729272423000 |
| 17 | 40191624107086745693400 |
[1,10,70,2100,23100,1051050,14294280,814773960, 12547518984,824551247520,13781785137120, 999179422441200,17699749768958400, 1379105502831342000,25513451802379827000, 2100607531729272423000,40191624107086745693400] |