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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 8 |
| 4 | 4913 |
| 5 | 16974593 |
| 6 | 20346417 |
| 7 | 68769820673 |
| 8 | 83396175409 |
| 9 | 281487861809153 |
| 10 | 284799399232257 |
| 11 | 337866128966449 |
| 12 | 1152924803144876033 |
| 13 | 1167339716607161089 |
| 14 | 1382949865068368689 |
| 15 | 4722367327294625677313 |
| 16 | 4725826936714463031297 |
| 17 | 4778141888650615849729 |
[0,1,8,4913,16974593,20346417,68769820673, 83396175409,281487861809153,284799399232257, 337866128966449,1152924803144876033, 1167339716607161089,1382949865068368689, 4722367327294625677313,4725826936714463031297, 4778141888650615849729] |