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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 | 6 |
| 4 | 2112 |
| 5 | 98820 |
| 6 | 1574400 |
| 7 | 13676250 |
| 8 | 80631936 |
| 9 | 363204072 |
| 10 | 1342218240 |
| 11 | 4261697550 |
| 12 | 12000120000 |
| 13 | 30653510316 |
| 14 | 72237215232 |
| 15 | 159067919010 |
| 16 | 330577363200 |
| 17 | 653537970000 |
| 18 | 1236951760896 |
| 19 | 2253171240342 |
| 20 | 3967187906880 |
| 21 | 6776444390100 |
| 22 | 11264003520000 |
| 23 | 18268445544426 |
[0,0,0,6,2112,98820,1574400,13676250,80631936, 363204072,1342218240,4261697550,12000120000, 30653510316,72237215232,159067919010,330577363200, 653537970000,1236951760896,2253171240342, 3967187906880,6776444390100,11264003520000, 18268445544426] |