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 | 4 |
| 4 | 9 |
| 5 | 22 |
| 6 | 56 |
| 7 | 146 |
| 8 | 387 |
| 9 | 1039 |
| 10 | 2819 |
| 11 | 7717 |
| 12 | 21287 |
| 13 | 59105 |
| 14 | 165038 |
| 15 | 463089 |
| 16 | 1304945 |
| 17 | 3690970 |
| 18 | 10474213 |
| 19 | 29811119 |
| 20 | 85070660 |
| 21 | 243340754 |
| 22 | 697571153 |
| 23 | 2003636629 |
| 24 | 5765473829 |
| 25 | 16617825248 |
| 26 | 47971281916 |
| 27 | 138677926537 |
[1,1,2,4,9,22,56,146,387,1039,2819,7717,21287, 59105,165038,463089,1304945,3690970,10474213, 29811119,85070660,243340754,697571153,2003636629, 5765473829,16617825248,47971281916,138677926537] |