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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 38 |
| 2 | 798 |
| 3 | 12236 |
| 4 | 152950 |
| 5 | 1651860 |
| 6 | 15967980 |
| 7 | 141430680 |
| 8 | 1166803110 |
| 9 | 9075135300 |
| 10 | 67156001220 |
| 11 | 476197099560 |
| 12 | 3254013513660 |
| 13 | 21526550936520 |
| 14 | 138384970306200 |
| 15 | 867212480585520 |
| 16 | 5311676443586310 |
| 17 | 31870058661517860 |
| 18 | 187679234340049620 |
| 19 | 1086563988284497800 |
[1,38,798,12236,152950,1651860,15967980,141430680, 1166803110,9075135300,67156001220,476197099560, 3254013513660,21526550936520,138384970306200, 867212480585520,5311676443586310, 31870058661517860,187679234340049620, 1086563988284497800] |