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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 16 |
| 2 | 124 |
| 3 | 796 |
| 4 | 5924 |
| 5 | 44916 |
| 6 | 348652 |
| 7 | 2743036 |
| 8 | 21801764 |
| 9 | 174565444 |
| 10 | 1405459324 |
| 11 | 11362215276 |
| 12 | 92138276228 |
| 13 | 748875775404 |
| 14 | 6097017988948 |
| 15 | 49701864868956 |
| 16 | 405539673414148 |
| 17 | 3311264043438796 |
| 18 | 27050524930821556 |
| 19 | 221065493126829404 |
[1,16,124,796,5924,44916,348652,2743036,21801764, 174565444,1405459324,11362215276,92138276228, 748875775404,6097017988948,49701864868956, 405539673414148,3311264043438796, 27050524930821556,221065493126829404] |