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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 57 |
| 3 | 866 |
| 4 | 18444 |
| 5 | 492924 |
| 6 | 15424611 |
| 7 | 542166480 |
| 8 | 20861518935 |
| 9 | 864061112296 |
| 10 | 38081996557383 |
| 11 | 1771322835258594 |
| 12 | 86425203984341130 |
| 13 | 4402953230795279532 |
| 14 | 233372023965531945057 |
| 15 | 12832558973488295874402 |
| 16 | 730347857708249147767893 |
[1,6,57,866,18444,492924,15424611,542166480, 20861518935,864061112296,38081996557383, 1771322835258594,86425203984341130, 4402953230795279532,233372023965531945057, 12832558973488295874402,730347857708249147767893] |