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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
| 6 | 6 |
| 7 | 7 |
| 8 | 23 |
| 9 | 56 |
| 10 | 77 |
| 11 | 103 |
| 12 | 320 |
| 13 | 1477 |
| 14 | 1821 |
| 15 | 2992 |
| 16 | 15290 |
| 17 | 180168 |
| 18 | 410498 |
| 19 | 548816 |
| 20 | 672732 |
| 21 | 2601223 |