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 | 13 |
| 3 | 37 |
| 4 | 101 |
| 5 | 273 |
| 6 | 737 |
| 7 | 1990 |
| 8 | 5374 |
| 9 | 14513 |
| 10 | 39194 |
| 11 | 105848 |
| 12 | 285855 |
| 13 | 771985 |
| 14 | 2084836 |
| 15 | 5630344 |
| 16 | 15205404 |
| 17 | 41063976 |
| 18 | 110898081 |
| 19 | 299493268 |
| 20 | 808816679 |
| 21 | 2184304257 |
| 22 | 5898969706 |
| 23 | 15930859211 |
| 24 | 43023152830 |
| 25 | 116189067703 |