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) |
|---|---|
| 0 | 1 |
| 1 | 65 |
| 2 | 4289 |
| 3 | 283009 |
| 4 | 18674305 |
| 5 | 1232221121 |
| 6 | 81307919681 |
| 7 | 5365090477825 |
| 8 | 354014663616769 |
| 9 | 23359602708228929 |
| 10 | 1541379764079492545 |
| 11 | 101707704826538279041 |
| 12 | 6711167138787446924161 |
| 13 | 442835323455144958715585 |
| 14 | 29220420180900779828304449 |
| 15 | 1928104896615996323709378049 |