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 | 57 |
| 2 | 869 |
| 3 | 6637 |
| 4 | 33111 |
| 5 | 124223 |
| 6 | 380731 |
| 7 | 1004307 |
| 8 | 2360501 |
| 9 | 5064013 |
| 10 | 10089705 |
| 11 | 18912785 |
| 12 | 33681595 |
| 13 | 57426435 |
| 14 | 94307855 |
| 15 | 149907847 |
| 16 | 231567369 |
| 17 | 348773633 |
| 18 | 513600589 |
| 19 | 741206037 |
| 20 | 1050388799 |
| 21 | 1464209383 |