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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 | 2 |
| 3 | 18 |
| 4 | 48 |
| 5 | 840 |
| 6 | 9360 |
| 7 | 90720 |
| 8 | 1653120 |
| 9 | 25764480 |
| 10 | 442713600 |
| 11 | 9540115200 |
| 12 | 201659673600 |
| 13 | 4744989849600 |
| 14 | 123531638630400 |
| 15 | 3325415917824000 |
| 16 | 97123590660096000 |
| 17 | 3021564701675520000 |
| 18 | 98526128957448192000 |
[1,0,2,18,48,840,9360,90720,1653120,25764480, 442713600,9540115200,201659673600,4744989849600, 123531638630400,3325415917824000, 97123590660096000,3021564701675520000, 98526128957448192000] |