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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 337 |
| 3 | 420 |
| 4 | 94079 |
| 5 | 23380 |
| 6 | 7310017 |
| 7 | 1293740 |
| 8 | 288072959 |
| 9 | 71166564 |
| 10 | 34760066885 |
| 11 | 3891972700 |
| 12 | 78405340889549 |
| 13 | 211633797908 |
| 14 | 9344085989959 |
| 15 | 11444459810700 |
| 16 | 42834713920531423 |
| 17 | 615586429603012 |
| 18 | 3595846729974153499 |
| 19 | 32943289821073340 |
| 20 | 79382189385869287789 |
[1,15,337,420,94079,23380,7310017,1293740, 288072959,71166564,34760066885,3891972700, 78405340889549,211633797908,9344085989959, 11444459810700,42834713920531423,615586429603012, 3595846729974153499,32943289821073340, 79382189385869287789] |