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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 38 |
| 4 | 386 |
| 5 | 4904 |
| 6 | 74776 |
| 7 | 1330272 |
| 8 | 27046848 |
| 9 | 618653280 |
| 10 | 15723024864 |
| 11 | 439559609664 |
| 12 | 13405656582336 |
| 13 | 442915145716224 |
| 14 | 15759326934391296 |
| 15 | 600783539885546496 |
| 16 | 24430204949876794368 |
| 17 | 1055516761826050203648 |
| 18 | 48286612866726631489536 |
| 19 | 2331682676308057000255488 |
[1,1,5,38,386,4904,74776,1330272,27046848, 618653280,15723024864,439559609664,13405656582336, 442915145716224,15759326934391296, 600783539885546496,24430204949876794368, 1055516761826050203648,48286612866726631489536, 2331682676308057000255488] |