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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 3 |
| 7 | 5 |
| 8 | 14 |
| 9 | 27 |
| 10 | 65 |
| 11 | 142 |
| 12 | 338 |
| 13 | 773 |
| 14 | 1832 |
| 15 | 4296 |
| 16 | 10231 |
| 17 | 24296 |
| 18 | 58128 |
| 19 | 139132 |
| 20 | 334350 |
| 21 | 804441 |
| 22 | 1940239 |
| 23 | 4685806 |
| 24 | 11335797 |
| 25 | 27455949 |
| 26 | 66585170 |
| 27 | 161646826 |
[0,0,0,1,1,3,5,14,27,65,142,338,773,1832,4296, 10231,24296,58128,139132,334350,804441,1940239, 4685806,11335797,27455949,66585170,161646826] |