The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 9 |
| 4 | 0 |
| 5 | 45 |
| 6 | 1080 |
| 7 | 630 |
| 8 | 30240 |
| 9 | 470610 |
| 10 | 1247400 |
| 11 | 38170440 |
| 12 | 523908000 |
| 13 | 3454050600 |
| 14 | 87950182320 |
| 15 | 1245647403000 |
| 16 | 14580569203200 |
| 17 | 346019491818000 |
| 18 | 5524280291930400 |
| 19 | 92520760776444000 |
| 20 | 2188180621979352000 |
| 21 | 40781057935225608000 |
| 22 | 857154570994798876800 |
[1,0,0,9,0,45,1080,630,30240,470610,1247400, 38170440,523908000,3454050600,87950182320, 1245647403000,14580569203200,346019491818000, 5524280291930400,92520760776444000, 2188180621979352000,40781057935225608000, 857154570994798876800] |