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 | 6 |
| 2 | 66 |
| 3 | 786 |
| 4 | 9426 |
| 5 | 113106 |
| 6 | 1357266 |
| 7 | 16287186 |
| 8 | 195446226 |
| 9 | 2345354706 |
| 10 | 28144256466 |
| 11 | 337731077586 |
| 12 | 4052772931026 |
| 13 | 48633275172306 |
| 14 | 583599302067666 |
| 15 | 7003191624811986 |
| 16 | 84038299497743826 |
| 17 | 1008459593972925906 |
| 18 | 12101515127675110866 |