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 | 3 |
| 2 | 8 |
| 3 | 23 |
| 4 | 55 |
| 5 | 149 |
| 6 | 339 |
| 7 | 889 |
| 8 | 1966 |
| 9 | 5059 |
| 10 | 10985 |
| 11 | 27939 |
| 12 | 59898 |
| 13 | 151210 |
| 14 | 321155 |
| 15 | 806806 |
| 16 | 1701347 |
| 17 | 4260511 |
| 18 | 8933737 |
| 19 | 22325426 |
| 20 | 46600476 |
| 21 | 116300505 |
| 22 | 241846731 |
| 23 | 603086027 |
| 24 | 1250175771 |
| 25 | 3116094702 |
| 26 | 6442311137 |
| 27 | 16054097455 |
| 28 | 33114584924 |