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 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 15 |
| 5 | 31 |
| 6 | 75 |
| 7 | 164 |
| 8 | 388 |
| 9 | 887 |
| 10 | 2092 |
| 11 | 4884 |
| 12 | 11599 |
| 13 | 27443 |
| 14 | 65509 |
| 15 | 156427 |
| 16 | 375263 |
| 17 | 901353 |
| 18 | 2171313 |
| 19 | 5237581 |
| 20 | 12658815 |
| 21 | 30633725 |
| 22 | 74238228 |
| 23 | 180106656 |
| 24 | 437437445 |
| 25 | 1063425655 |
| 26 | 2587564434 |
| 27 | 6301175326 |
| 28 | 15356071604 |
| 29 | 37448674536 |