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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 | 0 |
| 4 | 20 |
| 5 | 1655 |
| 6 | 65305 |
| 7 | 1794730 |
| 8 | 40179930 |
| 9 | 793030245 |
| 10 | 14423331635 |
| 11 | 248261291960 |
| 12 | 4113063835540 |
| 13 | 66327037011235 |
| 14 | 1049050826515965 |
| 15 | 16360528085273190 |
| 16 | 252545239130514350 |
| 17 | 3869090307434050625 |
| 18 | 58948119057416280295 |
| 19 | 894447719738683138420 |
[0,0,0,0,20,1655,65305,1794730,40179930,793030245, 14423331635,248261291960,4113063835540, 66327037011235,1049050826515965,16360528085273190, 252545239130514350,3869090307434050625, 58948119057416280295,894447719738683138420] |