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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 120 |
| 3 | 1230 |
| 4 | 13650 |
| 5 | 166376 |
| 6 | 2229444 |
| 7 | 32724810 |
| 8 | 523531470 |
| 9 | 9080409492 |
| 10 | 169892449584 |
| 11 | 3412891866566 |
| 12 | 73300097535210 |
| 13 | 1676670468061920 |
| 14 | 40704197313912060 |
| 15 | 1045464783485987298 |
| 16 | 28328001168991093350 |
[1,12,120,1230,13650,166376,2229444,32724810, 523531470,9080409492,169892449584,3412891866566, 73300097535210,1676670468061920,40704197313912060, 1045464783485987298,28328001168991093350] |