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 | 18 |
| 2 | 134 |
| 3 | 1080 |
| 4 | 8978 |
| 5 | 75888 |
| 6 | 649154 |
| 7 | 5606640 |
| 8 | 48811778 |
| 9 | 427774608 |
| 10 | 3769260674 |
| 11 | 33358388400 |
| 12 | 296270827778 |
| 13 | 2638754846928 |
| 14 | 23555015544194 |
| 15 | 210638693637360 |
| 16 | 1886253119486978 |
| 17 | 16909812213784848 |
| 18 | 151723048895171714 |