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 | 19 |
| 2 | 55 |
| 3 | 127 |
| 4 | 339 |
| 5 | 899 |
| 6 | 2455 |
| 7 | 6767 |
| 8 | 18859 |
| 9 | 52939 |
| 10 | 149535 |
| 11 | 424487 |
| 12 | 1210059 |
| 13 | 3461659 |
| 14 | 9933055 |
| 15 | 28577687 |
| 16 | 82409179 |
| 17 | 238128539 |
| 18 | 689345935 |
| 19 | 1998806327 |
| 20 | 5804195179 |
| 21 | 16876837979 |
| 22 | 49132180735 |
| 23 | 143192973047 |
| 24 | 417751959379 |