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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 27 |
| 4 | 249 |
| 5 | 2085 |
| 6 | 30645 |
| 7 | 354375 |
| 8 | 6542865 |
| 9 | 108554985 |
| 10 | 2330525925 |
| 11 | 45331607475 |
| 12 | 1288779532425 |
| 13 | 28889867731725 |
| 14 | 876160258298325 |
| 15 | 25315531795929375 |
| 16 | 860642393272286625 |
| 17 | 26527678331237708625 |
| 18 | 1063065483349950205125 |
| 19 | 36393649136002135852875 |
[1,1,5,27,249,2085,30645,354375,6542865,108554985, 2330525925,45331607475,1288779532425, 28889867731725,876160258298325,25315531795929375, 860642393272286625,26527678331237708625, 1063065483349950205125,36393649136002135852875] |