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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 13 |
| 2 | 638 |
| 3 | 41476 |
| 4 | 3015296 |
| 5 | 232878412 |
| 6 | 18691183682 |
| 7 | 1540840801552 |
| 8 | 129548309399618 |
| 9 | 11057865563760844 |
| 10 | 955237244106091682 |
| 11 | 83324522236732005112 |
| 12 | 7327068320498628273506 |
| 13 | 648679579345635742189498 |
| 14 | 57761885964038080406607410 |
| 15 | 5169168679056263697679753150 |
[1,13,638,41476,3015296,232878412,18691183682, 1540840801552,129548309399618,11057865563760844, 955237244106091682,83324522236732005112, 7327068320498628273506,648679579345635742189498, 57761885964038080406607410, 5169168679056263697679753150] |