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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 | 1 |
| 3 | 3 |
| 4 | 15 |
| 5 | 110 |
| 6 | 1080 |
| 7 | 13377 |
| 8 | 200704 |
| 9 | 3542940 |
| 10 | 72000000 |
| 11 | 1656409535 |
| 12 | 42568187904 |
| 13 | 1208912928522 |
| 14 | 37603105146880 |
| 15 | 1271514111328125 |
| 16 | 46443371157258240 |
| 17 | 1822442358054692408 |
| 18 | 76461926986744528896 |
| 19 | 3415753581721829617275 |
[0,1,3,15,110,1080,13377,200704,3542940,72000000, 1656409535,42568187904,1208912928522, 37603105146880,1271514111328125,46443371157258240, 1822442358054692408,76461926986744528896, 3415753581721829617275] |