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 | 0 |
| 2 | 34 |
| 3 | 26 |
| 4 | 229 |
| 5 | 1858 |
| 6 | 12224 |
| 7 | 74725 |
| 8 | 547497 |
| 9 | 4012035 |
| 10 | 28805843 |
| 11 | 209118279 |
| 12 | 1537327380 |
| 13 | 11240705948 |
| 14 | 82185225848 |
| 15 | 602873376262 |
| 16 | 4421261929905 |
| 17 | 32410993796867 |
| 18 | 237712768537660 |
| 19 | 1743828733781802 |
| 20 | 12791372365817836 |