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 | 5 |
| 2 | 4 |
| 3 | 11 |
| 4 | 26 |
| 5 | 71 |
| 6 | 173 |
| 7 | 450 |
| 8 | 1132 |
| 9 | 2898 |
| 10 | 7393 |
| 11 | 18987 |
| 12 | 48796 |
| 13 | 125963 |
| 14 | 325786 |
| 15 | 845153 |
| 16 | 2197255 |
| 17 | 5725849 |
| 18 | 14950221 |
| 19 | 39110366 |
| 20 | 102488189 |
| 21 | 269002371 |
| 22 | 707090144 |
| 23 | 1861183842 |
| 24 | 4905157159 |
| 25 | 12942843383 |