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 | 3 |
| 4 | 6 |
| 5 | 13 |
| 6 | 30 |
| 7 | 72 |
| 8 | 178 |
| 9 | 450 |
| 10 | 1158 |
| 11 | 3023 |
| 12 | 7986 |
| 13 | 21309 |
| 14 | 57346 |
| 15 | 155469 |
| 16 | 424206 |
| 17 | 1164039 |
| 18 | 3210246 |
| 19 | 8893161 |
| 20 | 24735666 |
| 21 | 69051303 |
| 22 | 193399578 |
| 23 | 543310782 |
| 24 | 1530523638 |
| 25 | 4322488212 |
| 26 | 12236130298 |
| 27 | 34713220977 |
| 28 | 98677591278 |