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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 864 |
| 3 | 1872 |
| 4 | 4056 |
| 5 | 13104 |
| 6 | 42336 |
| 7 | 138600 |
| 8 | 453750 |
| 9 | 1506450 |
| 10 | 5001414 |
| 11 | 16784592 |
| 12 | 56328576 |
| 13 | 190035408 |
| 14 | 641121414 |
| 15 | 2165870262 |
| 16 | 7316857446 |
| 17 | 24718829850 |
| 18 | 83508603750 |
| 19 | 282120696000 |
| 20 | 953100441600 |
| 21 | 3220293856320 |
| 22 | 10880587258614 |
[12,864,1872,4056,13104,42336,138600,453750, 1506450,5001414,16784592,56328576,190035408, 641121414,2165870262,7316857446,24718829850, 83508603750,282120696000,953100441600, 3220293856320,10880587258614] |