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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 71 |
| 3 | 1046 |
| 4 | 17231 |
| 5 | 303876 |
| 6 | 5611556 |
| 7 | 107128046 |
| 8 | 2097177071 |
| 9 | 41870595806 |
| 10 | 849284396751 |
| 11 | 17451906690856 |
| 12 | 362539208779396 |
| 13 | 7601087206512096 |
| 14 | 160635649725455256 |
| 15 | 3418231465333316126 |
| 16 | 73178876192536066031 |
| 17 | 1575035438677302619746 |
[1,6,71,1046,17231,303876,5611556,107128046, 2097177071,41870595806,849284396751, 17451906690856,362539208779396,7601087206512096, 160635649725455256,3418231465333316126, 73178876192536066031,1575035438677302619746] |