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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 | 3 |
| 2 | 15 |
| 3 | 120 |
| 4 | 1365 |
| 5 | 20349 |
| 6 | 376740 |
| 7 | 8347680 |
| 8 | 215553195 |
| 9 | 6358402050 |
| 10 | 210980549208 |
| 11 | 7778680504140 |
| 12 | 315502265971620 |
| 13 | 13961746143269400 |
| 14 | 669413654240461560 |
| 15 | 34569147570568156800 |
| 16 | 1912924003884628655655 |
| 17 | 112923282067713332728110 |
[1,3,15,120,1365,20349,376740,8347680,215553195, 6358402050,210980549208,7778680504140, 315502265971620,13961746143269400, 669413654240461560,34569147570568156800, 1912924003884628655655,112923282067713332728110] |