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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 13 |
| 3 | 281 |
| 4 | 8691 |
| 5 | 351625 |
| 6 | 17612057 |
| 7 | 1052705857 |
| 8 | 73152856651 |
| 9 | 5796006791037 |
| 10 | 515777928208797 |
| 11 | 50936751348311609 |
| 12 | 5528394469691073475 |
| 13 | 654111729553888537425 |
| 14 | 83796907707907976374065 |
| 15 | 11555724312003240036796545 |
| 16 | 1706764715516969234087492715 |
| 17 | 268812993066150470621848767445 |
[1,1,13,281,8691,351625,17612057,1052705857, 73152856651,5796006791037,515777928208797, 50936751348311609,5528394469691073475, 654111729553888537425,83796907707907976374065, 11555724312003240036796545, 1706764715516969234087492715, 268812993066150470621848767445] |