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 | 5 |
| 2 | 20 |
| 3 | 57 |
| 4 | 233 |
| 5 | 980 |
| 6 | 3508 |
| 7 | 14868 |
| 8 | 58405 |
| 9 | 229204 |
| 10 | 920924 |
| 11 | 3674453 |
| 12 | 14688173 |
| 13 | 58779657 |
| 14 | 235052852 |
| 15 | 939831460 |