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 | 2 |
| 2 | 4 |
| 3 | 10 |
| 4 | 30 |
| 5 | 90 |
| 6 | 264 |
| 7 | 754 |
| 8 | 2106 |
| 9 | 5778 |
| 10 | 15628 |
| 11 | 41786 |
| 12 | 110678 |
| 13 | 290858 |
| 14 | 759312 |
| 15 | 1971042 |
| 16 | 5091442 |
| 17 | 13095586 |
| 18 | 33555988 |
| 19 | 85695978 |
| 20 | 218198158 |
| 21 | 554081146 |
| 22 | 1403588376 |
| 23 | 3547702610 |
| 24 | 8949110954 |
| 25 | 22532603954 |
| 26 | 56637795100 |
| 27 | 142141826074 |
| 28 | 356212187334 |
| 29 | 891481312842 |
[1,2,4,10,30,90,264,754,2106,5778,15628,41786, 110678,290858,759312,1971042,5091442,13095586, 33555988,85695978,218198158,554081146,1403588376, 3547702610,8949110954,22532603954,56637795100, 142141826074,356212187334,891481312842] |