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 | 3 |
| 4 | 11 |
| 5 | 45 |
| 6 | 197 |
| 7 | 902 |
| 8 | 4269 |
| 9 | 20717 |
| 10 | 102531 |
| 11 | 515521 |
| 12 | 2625909 |
| 13 | 13521776 |
| 14 | 70274194 |
| 15 | 368131940 |
| 16 | 1941801115 |
| 17 | 10304601189 |
| 18 | 54976677289 |
| 19 | 294708283729 |
| 20 | 1586565791533 |
| 21 | 8574185062861 |
| 22 | 46498569928775 |
| 23 | 252966168370110 |
| 24 | 1380203261726925 |
| 25 | 7550534790990360 |
[1,1,3,11,45,197,902,4269,20717,102531,515521, 2625909,13521776,70274194,368131940,1941801115, 10304601189,54976677289,294708283729, 1586565791533,8574185062861,46498569928775, 252966168370110,1380203261726925,7550534790990360] |