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 | 18 |
| 2 | 197 |
| 3 | 1694 |
| 4 | 12586 |
| 5 | 84708 |
| 6 | 530733 |
| 7 | 3149542 |
| 8 | 17910398 |
| 9 | 98409532 |
| 10 | 525628194 |
| 11 | 2741723180 |
| 12 | 14015785460 |
| 13 | 70417793992 |
| 14 | 348499310973 |
| 15 | 1702076053686 |
| 16 | 8216326834550 |
| 17 | 39251274184780 |
| 18 | 185770424237398 |
| 19 | 871859230081092 |