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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 61 |
| 3 | 1660 |
| 4 | 47460 |
| 5 | 1621116 |
| 6 | 58002140 |
| 7 | 2213389940 |
| 8 | 87301563690 |
| 9 | 3555890156445 |
| 10 | 148125509781095 |
| 11 | 6292884402884976 |
| 12 | 271565202254735207 |
| 13 | 11878392121526009800 |
| 14 | 525519782174930309205 |
| 15 | 23481280252471520720288 |
| 16 | 1058270749214634093475910 |
| 17 | 48058678036035725619136698 |
[1,5,61,1660,47460,1621116,58002140,2213389940, 87301563690,3555890156445,148125509781095, 6292884402884976,271565202254735207, 11878392121526009800,525519782174930309205, 23481280252471520720288,1058270749214634093475910, 48058678036035725619136698] |