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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 18 |
| 2 | 198 |
| 3 | 1680 |
| 4 | 12060 |
| 5 | 76824 |
| 6 | 446952 |
| 7 | 2420352 |
| 8 | 12363120 |
| 9 | 60151520 |
| 10 | 280833696 |
| 11 | 1265442048 |
| 12 | 5528697408 |
| 13 | 23507763840 |
| 14 | 97575960960 |
| 15 | 396398370816 |
| 16 | 1579498956288 |
| 17 | 6184543546368 |
| 18 | 23833455191040 |
| 19 | 90522348871680 |
| 20 | 339263015528448 |
| 21 | 1255995653197824 |
| 22 | 4597442198728704 |
[1,18,198,1680,12060,76824,446952,2420352, 12363120,60151520,280833696,1265442048,5528697408, 23507763840,97575960960,396398370816, 1579498956288,6184543546368,23833455191040, 90522348871680,339263015528448,1255995653197824, 4597442198728704] |