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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 81 |
| 3 | 1386 |
| 4 | 26676 |
| 5 | 551124 |
| 6 | 11939967 |
| 7 | 267647490 |
| 8 | 6155681103 |
| 9 | 144442697256 |
| 10 | 3444310087155 |
| 11 | 83222570083068 |
| 12 | 2033143391152440 |
| 13 | 50136558534943776 |
| 14 | 1246312401751305306 |
| 15 | 31197886757177379570 |
| 16 | 785732617740674763684 |
| 17 | 19896044539519213482690 |
[1,6,81,1386,26676,551124,11939967,267647490, 6155681103,144442697256,3444310087155, 83222570083068,2033143391152440,50136558534943776, 1246312401751305306,31197886757177379570, 785732617740674763684,19896044539519213482690] |