This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 11 |
| 4 | 51 |
| 5 | 323 |
| 6 | 3075 |
| 7 | 47427 |
| 8 | 1230787 |
| 9 | 54772163 |
| 10 | 4247022531 |
| 11 | 582413946819 |
| 12 | 143061847179203 |
| 13 | 63604391931367363 |
| 14 | 51621812365091401667 |
| 15 | 77028054123935294320579 |
| 16 | 212592144046864728487817155 |