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 | 24 |
| 3 | 89 |
| 4 | 297 |
| 5 | 1145 |
| 6 | 4461 |
| 7 | 17661 |
| 8 | 70037 |
| 9 | 278116 |
| 10 | 1105688 |
| 11 | 4386052 |
| 12 | 17391896 |
| 13 | 68794424 |
| 14 | 272505548 |
| 15 | 1086983752 |