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) |
|---|---|
| 2 | 1 |
| 3 | 4 |
| 4 | 18 |
| 5 | 80 |
| 6 | 367 |
| 7 | 1708 |
| 8 | 8122 |
| 9 | 39204 |
| 10 | 191963 |
| 11 | 950984 |
| 12 | 4759626 |
| 13 | 24030736 |
| 14 | 122258314 |
| 15 | 626162464 |
| 16 | 3225926450 |
| 17 | 16706775984 |
| 18 | 86928097451 |
| 19 | 454203897192 |
| 20 | 2382255252398 |
| 21 | 12537764465072 |
| 22 | 66193294753768 |
| 23 | 350472816969976 |
| 24 | 1860542261745782 |
| 25 | 9901018433270812 |
[1,4,18,80,367,1708,8122,39204,191963,950984, 4759626,24030736,122258314,626162464,3225926450, 16706775984,86928097451,454203897192, 2382255252398,12537764465072,66193294753768, 350472816969976,1860542261745782,9901018433270812] |