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 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 12 |
| 4 | 45 |
| 5 | 171 |
| 6 | 648 |
| 7 | 2457 |
| 8 | 9315 |
| 9 | 35316 |
| 10 | 133893 |
| 11 | 507627 |
| 12 | 1924560 |
| 13 | 7296561 |
| 14 | 27663363 |
| 15 | 104879772 |
| 16 | 397629405 |
| 17 | 1507527531 |
| 18 | 5715470808 |
| 19 | 21668995017 |
| 20 | 82153397475 |
| 21 | 311467177476 |
| 22 | 1180861724853 |
| 23 | 4476986706987 |
| 24 | 16973545295520 |
[0,1,3,12,45,171,648,2457,9315,35316,133893, 507627,1924560,7296561,27663363,104879772, 397629405,1507527531,5715470808,21668995017, 82153397475,311467177476,1180861724853, 4476986706987,16973545295520] |