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 | 6 |
| 4 | 19 |
| 5 | 67 |
| 6 | 261 |
| 7 | 1043 |
| 8 | 4339 |
| 9 | 18503 |
| 10 | 80384 |
| 11 | 354740 |
| 12 | 1585917 |
| 13 | 7161755 |
| 14 | 32631452 |
| 15 | 149791796 |
| 16 | 691983065 |
| 17 | 3214568803 |
| 18 | 15005803890 |
| 19 | 70346777076 |
| 20 | 331038719877 |
| 21 | 1563084382317 |
| 22 | 7402900834627 |
| 23 | 35156932411463 |
| 24 | 167377476828587 |
| 25 | 798660481273445 |
| 26 | 3818763850454642 |
| 27 | 18293807958359356 |
| 28 | 87789006215473697 |
[1,1,2,6,19,67,261,1043,4339,18503,80384,354740, 1585917,7161755,32631452,149791796,691983065, 3214568803,15005803890,70346777076,331038719877, 1563084382317,7402900834627,35156932411463, 167377476828587,798660481273445,3818763850454642, 18293807958359356,87789006215473697] |