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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 44 |
| 4 | 723 |
| 5 | 24655 |
| 6 | 1715816 |
| 7 | 239697569 |
| 8 | 69557364821 |
| 9 | 41297123651644 |
| 10 | 49900451628509015 |
| 11 | 125141540794392423599 |
| 12 | 641579398300246011553552 |
| 13 | 6729809577032172543373047313 |
| 14 | 146355880526667013027682326650073 |
| 15 | 6505380999057202235872595196799580684 |
[1,1,5,44,723,24655,1715816,239697569,69557364821, 41297123651644,49900451628509015, 125141540794392423599,641579398300246011553552, 6729809577032172543373047313, 146355880526667013027682326650073, 6505380999057202235872595196799580684] |