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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 5 |
| 9 | 11 |
| 10 | 23 |
| 11 | 38 |
| 12 | 81 |
| 13 | 220 |
| 14 | 567 |
| 15 | 1681 |
| 16 | 5209 |
| 17 | 18445 |
| 18 | 63999 |
| 19 | 259065 |
| 20 | 1109285 |
| 21 | 5269124 |
| 22 | 26433601 |
| 23 | 148185912 |
| 24 | 862407722 |
[1,1,1,1,1,1,1,5,11,23,38,81,220,567,1681,5209, 18445,63999,259065,1109285,5269124,26433601, 148185912,862407722] |