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 | 5 |
| 2 | 28 |
| 3 | 181 |
| 4 | 1333 |
| 5 | 11029 |
| 6 | 101351 |
| 7 | 1024949 |
| 8 | 11320359 |
| 9 | 135679037 |
| 10 | 1754890039 |
| 11 | 24375607333 |
| 12 | 362034474975 |
| 13 | 5727314152237 |
| 14 | 96171016597079 |
| 15 | 1708678290956405 |
| 16 | 32029999992261615 |
| 17 | 631834430396575613 |
| 18 | 13084795597366612231 |