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 | 11 |
| 2 | 143 |
| 3 | 1716 |
| 4 | 20724 |
| 5 | 248677 |
| 6 | 2985840 |
| 7 | 35829937 |
| 8 | 429979836 |
| 9 | 5159757900 |
| 10 | 61917341772 |
| 11 | 743008099548 |
| 12 | 8916100178843 |
| 13 | 106993202123808 |
| 14 | 1283918461295184 |
| 15 | 15407021535521759 |
| 16 | 184884258855973380 |
| 17 | 2218611106271412996 |
| 18 | 26623333280416468596 |
| 19 | 319479999364994391924 |