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) |
|---|---|
| 1 | 7 |
| 2 | 67 |
| 3 | 450 |
| 4 | 5161 |
| 5 | 36398 |
| 6 | 271764 |
| 7 | 2492182 |
| 8 | 17380978 |
| 9 | 143489019 |
| 10 | 1182292032 |
| 11 | 8603707764 |
| 12 | 72258762282 |
| 13 | 564807764665 |
| 14 | 4330558939711 |
| 15 | 35641259507701 |
| 16 | 274748439605812 |
| 17 | 2168553682544862 |
| 18 | 17443667551284635 |
| 19 | 135153953683819534 |