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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 11 |
| 5 | 28 |
| 6 | 74 |
| 7 | 206 |
| 8 | 601 |
| 9 | 1826 |
| 10 | 5766 |
| 11 | 18851 |
| 12 | 63676 |
| 13 | 221678 |
| 14 | 793958 |
| 15 | 2920292 |
| 16 | 11014653 |
| 17 | 42543773 |
| 18 | 168074091 |
| 19 | 678403932 |
| 20 | 2794920078 |
| 21 | 11742254750 |
| 22 | 50266213000 |
| 23 | 219085792538 |
| 24 | 971543475593 |
| 25 | 4380664101448 |
| 26 | 20071848941411 |
| 27 | 93403455862117 |
| 28 | 441206005123701 |
[1,1,2,5,11,28,74,206,601,1826,5766,18851,63676, 221678,793958,2920292,11014653,42543773,168074091, 678403932,2794920078,11742254750,50266213000, 219085792538,971543475593,4380664101448, 20071848941411,93403455862117,441206005123701] |