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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 6 |
| 3 | 20 |
| 4 | 685 |
| 5 | 5370 |
| 6 | 123410 |
| 7 | 1341616 |
| 8 | 25106526 |
| 9 | 321557310 |
| 10 | 5447475968 |
| 11 | 76079350800 |
| 12 | 1228204709225 |
| 13 | 17971182592538 |
| 14 | 283558808435910 |
| 15 | 4256630623481552 |
| 16 | 66474347415079345 |
| 17 | 1012439882213494794 |
[0,6,20,685,5370,123410,1341616,25106526, 321557310,5447475968,76079350800,1228204709225, 17971182592538,283558808435910,4256630623481552, 66474347415079345,1012439882213494794] |