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 | 3 |
| 9 | 11 |
| 10 | 21 |
| 11 | 45 |
| 12 | 95 |
| 13 | 317 |
| 14 | 775 |
| 15 | 2631 |
| 16 | 8089 |
| 17 | 34521 |
| 18 | 128479 |
| 19 | 651913 |
| 20 | 2804553 |
| 21 | 16941209 |
| 22 | 86096205 |
| 23 | 609652687 |
[1,1,1,1,1,1,1,3,11,21,45,95,317,775,2631,8089, 34521,128479,651913,2804553,16941209,86096205, 609652687] |