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 | 21 |
| 2 | 420 |
| 3 | 8400 |
| 4 | 168000 |
| 5 | 3360000 |
| 6 | 67200000 |
| 7 | 1344000000 |
| 8 | 26880000000 |
| 9 | 537599999790 |
| 10 | 10751999991600 |
| 11 | 215039999748210 |
| 12 | 4300799993288400 |
| 13 | 86015999832252000 |
| 14 | 1720319995974720000 |
| 15 | 34406399906088000000 |
[1,21,420,8400,168000,3360000,67200000,1344000000, 26880000000,537599999790,10751999991600, 215039999748210,4300799993288400, 86015999832252000,1720319995974720000, 34406399906088000000] |