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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 30 |
| 5 | 144 |
| 6 | 744 |
| 7 | 4047 |
| 8 | 22858 |
| 9 | 132830 |
| 10 | 789124 |
| 11 | 4771086 |
| 12 | 29259992 |
| 13 | 181569062 |
| 14 | 1137891460 |
| 15 | 7191411375 |
| 16 | 45780189690 |
| 17 | 293282202470 |
| 18 | 1889328747180 |
| 19 | 12231207808050 |
| 20 | 79532035376500 |
| 21 | 519196901292440 |
[0,1,2,7,30,144,744,4047,22858,132830,789124, 4771086,29259992,181569062,1137891460,7191411375, 45780189690,293282202470,1889328747180, 12231207808050,79532035376500,519196901292440] |