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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 24 |
| 3 | 234 |
| 4 | 2160 |
| 5 | 19602 |
| 6 | 176904 |
| 7 | 1593594 |
| 8 | 14346720 |
| 9 | 129133602 |
| 10 | 1162241784 |
| 11 | 10460294154 |
| 12 | 94143001680 |
| 13 | 847288078002 |
| 14 | 7625595890664 |
| 15 | 68630372581914 |
| 16 | 617673381935040 |
| 17 | 5559060523508802 |
| 18 | 50031544969859544 |
| 19 | 450283905503576874 |
[0,2,24,234,2160,19602,176904,1593594,14346720, 129133602,1162241784,10460294154,94143001680, 847288078002,7625595890664,68630372581914, 617673381935040,5559060523508802, 50031544969859544,450283905503576874] |