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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 8 |
| 5 | 25 |
| 6 | 77 |
| 7 | 258 |
| 8 | 871 |
| 9 | 3049 |
| 10 | 10834 |
| 11 | 39207 |
| 12 | 143609 |
| 13 | 532193 |
| 14 | 1990163 |
| 15 | 7503471 |
| 16 | 28486071 |
| 17 | 108809503 |
| 18 | 417862340 |
| 19 | 1612440612 |
| 20 | 6248778642 |
| 21 | 24309992576 |
| 22 | 94905791606 |
| 23 | 371691137827 |
| 24 | 1459935388202 |
| 25 | 5749666477454 |