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 | 10 |
| 2 | 11 |
| 3 | 38 |
| 4 | 19 |
| 5 | 245 |
| 6 | 131 |
| 7 | 15586 |
| 8 | 7853 |
| 9 | 1 |
| 10 | 16579 |
| 11 | 302339 |
| 12 | 26927 |
| 13 | 113866 |
| 14 | 780407 |
| 15 | 1620826 |
| 16 | 3734293 |
| 17 | 1814680193 |
| 18 | 130205087 |
| 19 | 10313514193 |
| 20 | 33221626487 |
| 21 | 16468720789 |