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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 20 |
| 3 | 136 |
| 4 | 1292 |
| 5 | 17400 |
| 6 | 335404 |
| 7 | 9317288 |
| 8 | 374916236 |
| 9 | 21939338488 |
| 10 | 1872964421084 |
| 11 | 233869019978312 |
| 12 | 42804259804575932 |
| 13 | 11504430006153224600 |
| 14 | 4547687849230636111212 |
| 15 | 2647655599871715881311656 |
[1,4,20,136,1292,17400,335404,9317288,374916236, 21939338488,1872964421084,233869019978312, 42804259804575932,11504430006153224600, 4547687849230636111212,2647655599871715881311656] |