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 | 3 |
| 2 | 21 |
| 3 | 156 |
| 4 | 1221 |
| 5 | 9828 |
| 6 | 80580 |
| 7 | 669294 |
| 8 | 5612805 |
| 9 | 47419905 |
| 10 | 402993396 |
| 11 | 3441242544 |
| 12 | 29502452868 |
| 13 | 253778827695 |
| 14 | 2189249293266 |
| 15 | 18932541179706 |
| 16 | 164081616775173 |
| 17 | 1424741956592535 |
| 18 | 12392093363519415 |
| 19 | 107946143556797700 |
| 20 | 941580123046540596 |
[1,3,21,156,1221,9828,80580,669294,5612805, 47419905,402993396,3441242544,29502452868, 253778827695,2189249293266,18932541179706, 164081616775173,1424741956592535, 12392093363519415,107946143556797700, 941580123046540596] |