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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 16 |
| 3 | 177 |
| 4 | 5548 |
| 5 | 39615 |
| 6 | 2236440 |
| 7 | 40325915 |
| 8 | 1207505768 |
| 9 | 13229393814 |
| 10 | 1737076976040 |
| 11 | 22446050738265 |
| 12 | 4058838484620084 |
| 13 | 60476452041557409 |
| 14 | 961082989270516112 |
| 15 | 32455938583801467735 |
| 16 | 9864953815464307351792 |
| 17 | 186195769473110823077652 |
| 18 | 70295408103581008790661648 |
| 19 | 1466826914074651870368663750 |
[1,16,177,5548,39615,2236440,40325915,1207505768, 13229393814,1737076976040,22446050738265, 4058838484620084,60476452041557409, 961082989270516112,32455938583801467735, 9864953815464307351792,186195769473110823077652, 70295408103581008790661648, 1466826914074651870368663750] |