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 | 25 |
| 2 | 301 |
| 3 | 2325 |
| 4 | 12951 |
| 5 | 55455 |
| 6 | 190051 |
| 7 | 536155 |
| 8 | 1271626 |
| 9 | 2579130 |
| 10 | 4540386 |
| 11 | 7036530 |
| 12 | 9740686 |
| 13 | 12236830 |
| 14 | 14198086 |
| 15 | 15505590 |
| 16 | 16241061 |
| 17 | 16587165 |
| 18 | 16721761 |
| 19 | 16764265 |
| 20 | 16774891 |
| 21 | 16776915 |
| 22 | 16777191 |
| 23 | 16777215 |
| 24 | 16777216 |
| 25 | 16777216 |