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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 20 |
| 7 | 47 |
| 8 | 111 |
| 9 | 269 |
| 10 | 650 |
| 11 | 1577 |
| 12 | 3808 |
| 13 | 9189 |
| 14 | 22079 |
| 15 | 52931 |
| 16 | 126486 |
| 17 | 301559 |
| 18 | 717129 |
| 19 | 1701909 |
| 20 | 4030658 |
| 21 | 9528769 |
| 22 | 22487287 |
| 23 | 52984134 |
| 24 | 124648730 |
| 25 | 292824200 |
| 26 | 686952007 |
| 27 | 1609445592 |
| 28 | 3765971432 |
| 29 | 8801379791 |
| 30 | 20545409197 |
[1,1,1,2,4,9,20,47,111,269,650,1577,3808,9189, 22079,52931,126486,301559,717129,1701909,4030658, 9528769,22487287,52984134,124648730,292824200, 686952007,1609445592,3765971432,8801379791, 20545409197] |