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 | 12 |
| 3 | 49 |
| 4 | 146 |
| 5 | 373 |
| 6 | 872 |
| 7 | 1929 |
| 8 | 4118 |
| 9 | 8589 |
| 10 | 17644 |
| 11 | 35889 |
| 12 | 72538 |
| 13 | 146021 |
| 14 | 293200 |
| 15 | 587801 |
| 16 | 1177278 |
| 17 | 2356541 |
| 18 | 4715412 |
| 19 | 9433537 |
| 20 | 18870210 |
| 21 | 37744021 |
| 22 | 75492152 |
| 23 | 150988969 |
| 24 | 301983206 |
| 25 | 603972333 |
| 26 | 1207951292 |
| 27 | 2415909969 |
| 28 | 4831828138 |
| 29 | 9663665349 |
| 30 | 19327340704 |