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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 48 |
| 2 | 1176 |
| 3 | 19648 |
| 4 | 252204 |
| 5 | 2655456 |
| 6 | 23901760 |
| 7 | 189208704 |
| 8 | 1344644814 |
| 9 | 8713158928 |
| 10 | 52107076128 |
| 11 | 290374290624 |
| 12 | 1519725061816 |
| 13 | 7518508799904 |
| 14 | 35352238216704 |
| 15 | 158716136933504 |
| 16 | 683059486979301 |
| 17 | 2827559773199856 |
[1,48,1176,19648,252204,2655456,23901760, 189208704,1344644814,8713158928,52107076128, 290374290624,1519725061816,7518508799904, 35352238216704,158716136933504,683059486979301, 2827559773199856] |