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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 14 |
| 5 | 47 |
| 6 | 148 |
| 7 | 454 |
| 8 | 1359 |
| 9 | 4004 |
| 10 | 11644 |
| 11 | 33521 |
| 12 | 95696 |
| 13 | 271300 |
| 14 | 764605 |
| 15 | 2143964 |
| 16 | 5985186 |
| 17 | 16643779 |
| 18 | 46124692 |
| 19 | 127433562 |
| 20 | 351106955 |
| 21 | 964976460 |
| 22 | 2646158176 |
| 23 | 7241414949 |
| 24 | 19779499584 |
| 25 | 53933402472 |
| 26 | 146828245753 |
| 27 | 399137621524 |
[0,1,4,14,47,148,454,1359,4004,11644,33521,95696, 271300,764605,2143964,5985186,16643779,46124692, 127433562,351106955,964976460,2646158176, 7241414949,19779499584,53933402472,146828245753, 399137621524] |