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) |
|---|---|
| 2 | 2 |
| 3 | 7 |
| 4 | 24 |
| 5 | 68 |
| 6 | 171 |
| 7 | 398 |
| 8 | 880 |
| 9 | 1880 |
| 10 | 3925 |
| 11 | 8070 |
| 12 | 16426 |
| 13 | 33216 |
| 14 | 66887 |
| 15 | 134334 |
| 16 | 269348 |
| 17 | 539512 |
| 18 | 1079993 |
| 19 | 2161126 |
| 20 | 4323582 |
| 21 | 8648704 |
| 22 | 17299179 |
| 23 | 34600382 |
| 24 | 69203064 |
| 25 | 138408728 |
| 26 | 276820381 |
| 27 | 553644038 |
| 28 | 1107291730 |
| 29 | 2214587520 |