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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 90 |
| 6 | 810 |
| 7 | 15120 |
| 8 | 68040 |
| 9 | 24494400 |
| 10 | 1020600 |
| 11 | 12933043200 |
| 12 | 9093546000 |
| 13 | 14122883174400 |
| 14 | 2482538058000 |
| 15 | 76263569141760000 |
| 16 | 59580913392000 |
| 17 | 15557768104919040000 |
| 18 | 14357510604637200000 |
| 19 | 28377369023372328960000 |
| 20 | 8183781044643204000000 |
| 21 | 3539793011975464314470400000 |
| 22 | 270064774473225732000000 |
| 23 | 13677760198273194111113625600000 |
[1,1,1,3,6,90,810,15120,68040,24494400,1020600, 12933043200,9093546000,14122883174400, 2482538058000,76263569141760000,59580913392000, 15557768104919040000,14357510604637200000, 28377369023372328960000,8183781044643204000000, 3539793011975464314470400000, 270064774473225732000000, 13677760198273194111113625600000] |