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 | 3 |
| 1 | 13 |
| 2 | 65 |
| 3 | 337 |
| 4 | 1737 |
| 5 | 8945 |
| 6 | 46073 |
| 7 | 237313 |
| 8 | 1222345 |
| 9 | 6296017 |
| 10 | 32429337 |
| 11 | 167036065 |
| 12 | 860364393 |
| 13 | 4431539313 |
| 14 | 22825840825 |
| 15 | 117570661697 |
| 16 | 605579465737 |
| 17 | 3119200691985 |
| 18 | 16066286106713 |
| 19 | 82753748396513 |