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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 9 |
| 6 | 49 |
| 7 | 306 |
| 8 | 2188 |
| 9 | 17810 |
| 10 | 162482 |
| 11 | 1642635 |
| 12 | 18231462 |
| 13 | 220420179 |
| 14 | 2883693795 |
| 15 | 40592133316 |
| 16 | 611765693528 |
| 17 | 9828843229764 |
| 18 | 167702100599524 |
| 19 | 3028466654021205 |
| 20 | 57708568527002410 |
| 21 | 1157199837194069405 |
[0,0,0,1,2,9,49,306,2188,17810,162482,1642635, 18231462,220420179,2883693795,40592133316, 611765693528,9828843229764,167702100599524, 3028466654021205,57708568527002410, 1157199837194069405] |