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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 15 |
| 3 | 635 |
| 4 | 53112 |
| 5 | 7367444 |
| 6 | 1529130770 |
| 7 | 443685287576 |
| 8 | 171495189203456 |
| 9 | 85174828026304824 |
| 10 | 52856314387144232184 |
| 11 | 40077340463437963801752 |
| 12 | 36457068309928364981668848 |
| 13 | 39186634107857517367884040632 |
[1,1,15,635,53112,7367444,1529130770,443685287576, 171495189203456,85174828026304824, 52856314387144232184,40077340463437963801752, 36457068309928364981668848, 39186634107857517367884040632] |