The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 12 |
| 3 | 65 |
| 4 | 460 |
| 5 | 4057 |
| 6 | 42922 |
| 7 | 529769 |
| 8 | 7472808 |
| 9 | 118586033 |
| 10 | 2090936014 |
| 11 | 40554647377 |
| 12 | 858082563532 |
| 13 | 19668880007129 |
| 14 | 485528656965762 |
| 15 | 12841428220413593 |
| 16 | 362276791422785488 |
| 17 | 10859170086870710497 |
| 18 | 344648459867067117334 |
| 19 | 11546148650974694099201 |
[1,3,12,65,460,4057,42922,529769,7472808, 118586033,2090936014,40554647377,858082563532, 19668880007129,485528656965762,12841428220413593, 362276791422785488,10859170086870710497, 344648459867067117334,11546148650974694099201] |