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 | 5 |
| 6 | 1 |
| 7 | 13 |
| 8 | 5 |
| 9 | 80 |
| 10 | 15 |
| 11 | 1622 |
| 12 | 239 |
| 13 | 39282 |
| 14 | 4131 |
| 15 | 1538621 |
| 16 | 99155 |
| 17 | 127226887 |
| 18 | 5960881 |
| 19 | 16725872953 |
| 20 | 549694386 |
| 21 | 3916428224133 |
[1,1,1,1,5,1,13,5,80,15,1622,239,39282,4131, 1538621,99155,127226887,5960881,16725872953, 549694386,3916428224133] |