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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 27 |
| 7 | 1463 |
| 8 | 5350936 |
| 9 | 154615586811211 |
| 10 | 1295349936263652139582251464117 |
| 11 | 6137049788665571444030885529267632764941063995324839557922175605 |
[1,1,1,1,2,5,27,1463,5350936,154615586811211, 1295349936263652139582251464117, 61370497886655714440308855292676327649410639953248\ 39557922175605] |