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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 50 |
| 4 | 1062 |
| 5 | 56712 |
| 6 | 7295812 |
| 7 | 1817321457 |
| 8 | 750572034647 |
| 9 | 467477187494249 |
| 10 | 413492386704135759 |
| 11 | 498000976932085045800 |
| 12 | 791133947048635010571251 |
| 13 | 1616618616930983136958492360 |
| 14 | 4162734189568898641317813946712 |
| 15 | 13276910075946265356264268787123401 |
[1,1,6,50,1062,56712,7295812,1817321457, 750572034647,467477187494249,413492386704135759, 498000976932085045800,791133947048635010571251, 1616618616930983136958492360, 4162734189568898641317813946712, 13276910075946265356264268787123401] |