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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 13 |
| 5 | 35 |
| 6 | 104 |
| 7 | 315 |
| 8 | 1021 |
| 9 | 3407 |
| 10 | 11814 |
| 11 | 41893 |
| 12 | 151688 |
| 13 | 556432 |
| 14 | 2063446 |
| 15 | 7709381 |
| 16 | 28977788 |
| 17 | 109421539 |
| 18 | 414759097 |
| 19 | 1577080457 |
| 20 | 6013019088 |
| 21 | 22980514005 |
| 22 | 88012484058 |
| 23 | 337717418145 |
| 24 | 1298113689274 |
| 25 | 4997561829650 |
| 26 | 19267942661664 |
| 27 | 74386901833067 |
| 28 | 287540841925770 |