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 | 1 |
| 4 | 6 |
| 5 | 23 |
| 6 | 87 |
| 7 | 335 |
| 8 | 1284 |
| 9 | 4929 |
| 10 | 18961 |
| 11 | 73116 |
| 12 | 282573 |
| 13 | 1094274 |
| 14 | 4245403 |
| 15 | 16498046 |
| 16 | 64209478 |
| 17 | 250241064 |
| 18 | 976467300 |
| 19 | 3814605426 |
| 20 | 14917391732 |
| 21 | 58391659033 |
| 22 | 228765630254 |
| 23 | 896981997531 |
| 24 | 3519684170479 |
| 25 | 13820615753489 |
| 26 | 54304256383270 |
| 27 | 213503120858342 |
| 28 | 839887961545873 |
| 29 | 3305747913345551 |
[0,0,1,6,23,87,335,1284,4929,18961,73116,282573, 1094274,4245403,16498046,64209478,250241064, 976467300,3814605426,14917391732,58391659033, 228765630254,896981997531,3519684170479, 13820615753489,54304256383270,213503120858342, 839887961545873,3305747913345551] |