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 | 12 |
| 2 | 62 |
| 3 | 342 |
| 4 | 1922 |
| 5 | 10902 |
| 6 | 62282 |
| 7 | 358062 |
| 8 | 2070242 |
| 9 | 12030822 |
| 10 | 70231802 |
| 11 | 411625182 |
| 12 | 2420922962 |
| 13 | 14281397142 |
| 14 | 84467679722 |
| 15 | 500702562702 |
| 16 | 2973697798082 |
| 17 | 17689598897862 |
| 18 | 105374653934042 |
| 19 | 628433226338622 |