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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 3 |
| 4 | 0 |
| 5 | 15 |
| 6 | 180 |
| 7 | 105 |
| 8 | 5040 |
| 9 | 46305 |
| 10 | 132300 |
| 11 | 3752595 |
| 12 | 33679800 |
| 13 | 243378135 |
| 14 | 5565940380 |
| 15 | 56191160025 |
| 16 | 712410098400 |
| 17 | 14889814164225 |
| 18 | 183558878603100 |
| 19 | 3236148386145675 |
| 20 | 66650136566013000 |
| 21 | 1027807726886515575 |
| 22 | 21983938825036488300 |
| 23 | 469896981350215644225 |
[1,0,0,3,0,15,180,105,5040,46305,132300,3752595, 33679800,243378135,5565940380,56191160025, 712410098400,14889814164225,183558878603100, 3236148386145675,66650136566013000, 1027807726886515575,21983938825036488300, 469896981350215644225] |