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 | 1 |
| 2 | 15 |
| 3 | 356 |
| 4 | 8232 |
| 5 | 146300 |
| 6 | 1874539 |
| 7 | 17870566 |
| 8 | 133496644 |
| 9 | 817995997 |
| 10 | 4261304129 |
| 11 | 19398449839 |
| 12 | 78815353079 |
| 13 | 290571063342 |
| 14 | 984899160732 |
| 15 | 3101890356933 |
| 16 | 9156259810369 |
| 17 | 25514373644936 |
| 18 | 67521447453170 |
| 19 | 170570662562363 |