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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 | 12 |
| 3 | 54 |
| 4 | 432 |
| 5 | 3108 |
| 6 | 22428 |
| 7 | 162504 |
| 8 | 1175592 |
| 9 | 8507376 |
| 10 | 61562808 |
| 11 | 445491480 |
| 12 | 3223753560 |
| 13 | 23328341064 |
| 14 | 168813022728 |
| 15 | 1221597213768 |
| 16 | 8839956302856 |
| 17 | 63969389202792 |
| 18 | 462907576993032 |
| 19 | 3349780692313320 |
| 20 | 24240326242963080 |
[0,12,54,432,3108,22428,162504,1175592,8507376, 61562808,445491480,3223753560,23328341064, 168813022728,1221597213768,8839956302856, 63969389202792,462907576993032,3349780692313320, 24240326242963080] |