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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 120 |
| 3 | 1320 |
| 4 | 14630 |
| 5 | 160920 |
| 6 | 1771440 |
| 7 | 19485720 |
| 8 | 214357440 |
| 9 | 2357931730 |
| 10 | 25937408640 |
| 11 | 285311493720 |
| 12 | 3138428201160 |
| 13 | 34522710196920 |
| 14 | 379749831637440 |
| 15 | 4177248147997440 |
| 16 | 45949729842155150 |
| 17 | 505447028263532520 |
| 18 | 5559917313256631160 |
| 19 | 61159090445821012920 |
[1,10,120,1320,14630,160920,1771440,19485720, 214357440,2357931730,25937408640,285311493720, 3138428201160,34522710196920,379749831637440, 4177248147997440,45949729842155150, 505447028263532520,5559917313256631160, 61159090445821012920] |