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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 44 |
| 4 | 530 |
| 5 | 7911 |
| 6 | 139129 |
| 7 | 2798844 |
| 8 | 63178500 |
| 9 | 1578855377 |
| 10 | 43245568061 |
| 11 | 1288116498182 |
| 12 | 41457303331745 |
| 13 | 1433966498431138 |
| 14 | 53058288363011906 |
| 15 | 2091593330699875406 |
| 16 | 87527301512425974261 |
| 17 | 3875685191976323542974 |
| 18 | 181061755084572933223563 |
| 19 | 8900849566241379829936126 |
[1,1,5,44,530,7911,139129,2798844,63178500, 1578855377,43245568061,1288116498182, 41457303331745,1433966498431138,53058288363011906, 2091593330699875406,87527301512425974261, 3875685191976323542974,181061755084572933223563, 8900849566241379829936126] |