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 | 25 |
| 4 | 387 |
| 5 | 8521 |
| 6 | 241683 |
| 7 | 8383705 |
| 8 | 343826787 |
| 9 | 16273985641 |
| 10 | 873119718963 |
| 11 | 52360707915385 |
| 12 | 3470858539699587 |
| 13 | 252000934472119561 |
| 14 | 19888355652445884243 |
| 15 | 1695252683833578455065 |
| 16 | 155208762048402360698787 |
| 17 | 15190477481877333732410281 |
| 18 | 1582657042668691276257233523 |