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 | 4 |
| 2 | 14 |
| 3 | 48 |
| 4 | 141 |
| 5 | 396 |
| 6 | 1058 |
| 7 | 2696 |
| 8 | 6646 |
| 9 | 15884 |
| 10 | 36956 |
| 11 | 83976 |
| 12 | 186849 |
| 13 | 407864 |
| 14 | 875030 |
| 15 | 1847824 |
| 16 | 3845520 |
| 17 | 7895872 |
| 18 | 16010610 |
| 19 | 32088120 |
| 20 | 63611656 |
| 21 | 124817444 |
| 22 | 242560418 |
| 23 | 467095640 |
| 24 | 891754784 |
| 25 | 1688619460 |