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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 19 |
| 4 | 241 |
| 5 | 1601 |
| 6 | 32581 |
| 7 | 308995 |
| 8 | 8655809 |
| 9 | 106673761 |
| 10 | 3805452901 |
| 11 | 57704760851 |
| 12 | 2500580809585 |
| 13 | 45018720191329 |
| 14 | 2295683481085541 |
| 15 | 47848514992963651 |
| 16 | 2806491306922172161 |
| 17 | 66464103165835330625 |
| 18 | 4407449313521981148229 |
| 19 | 116893033842508769526931 |
[1,1,5,19,241,1601,32581,308995,8655809,106673761, 3805452901,57704760851,2500580809585, 45018720191329,2295683481085541,47848514992963651, 2806491306922172161,66464103165835330625, 4407449313521981148229,116893033842508769526931] |