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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 16 |
| 3 | 200 |
| 4 | 3264 |
| 5 | 65752 |
| 6 | 1565744 |
| 7 | 42878432 |
| 8 | 1324344832 |
| 9 | 45464289482 |
| 10 | 1715228012048 |
| 11 | 70471268834936 |
| 12 | 3129746696619072 |
| 13 | 149318596196238328 |
| 14 | 7612660420021177200 |
| 15 | 412865831480749700928 |
| 16 | 23725813528034949148672 |
| 17 | 1439701175150489313314864 |
| 18 | 91967625580609006328344400 |
| 19 | 6167733266497532499924699672 |
[1,2,16,200,3264,65752,1565744,42878432, 1324344832,45464289482,1715228012048, 70471268834936,3129746696619072, 149318596196238328,7612660420021177200, 412865831480749700928,23725813528034949148672, 1439701175150489313314864, 91967625580609006328344400, 6167733266497532499924699672] |