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 | 8 |
| 2 | 62 |
| 3 | 470 |
| 4 | 2666 |
| 5 | 13040 |
| 6 | 60180 |
| 7 | 273124 |
| 8 | 1248872 |
| 9 | 5780144 |
| 10 | 26993340 |
| 11 | 126638342 |
| 12 | 594901860 |
| 13 | 2793932346 |
| 14 | 13112533536 |
| 15 | 61505348386 |
| 16 | 288407464930 |
| 17 | 1352248997558 |
| 18 | 6340299132898 |
| 19 | 29728967922162 |
| 20 | 139400729229576 |
| 21 | 653670375108782 |