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 | 5 |
| 2 | 1301 |
| 3 | 331781 |
| 4 | 18974741 |
| 5 | 37015061 |
| 6 | 136048901 |
| 7 | 429981701 |
| 8 | 1196883221 |
| 9 | 1731891461 |
| 10 | 4032758021 |
| 11 | 4430766101 |
| 12 | 12745506821 |
| 13 | 13680577301 |
| 14 | 43237380101 |
| 15 | 74247530261 |
| 16 | 92844527621 |
| 17 | 151613669381 |
| 18 | 196741925141 |