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 | 7 |
| 2 | 35 |
| 3 | 196 |
| 4 | 994 |
| 5 | 4578 |
| 6 | 20118 |
| 7 | 84540 |
| 8 | 341397 |
| 9 | 1335103 |
| 10 | 5078227 |
| 11 | 18852428 |
| 12 | 68519920 |
| 13 | 244413820 |
| 14 | 857393700 |
| 15 | 2963013816 |
| 16 | 10102413972 |
| 17 | 34025396580 |
| 18 | 113329367816 |
| 19 | 373642488044 |
| 20 | 1220412680410 |
| 21 | 3951964394642 |
| 22 | 12695738508950 |
| 23 | 40484919514284 |
| 24 | 128216539026261 |