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 | 7 |
| 2 | 33 |
| 3 | 163 |
| 4 | 803 |
| 5 | 3971 |
| 6 | 19587 |
| 7 | 96693 |
| 8 | 477297 |
| 9 | 2355925 |
| 10 | 11629027 |
| 11 | 57401721 |
| 12 | 283338413 |
| 13 | 1398577069 |
| 14 | 6903468049 |
| 15 | 34075967931 |
| 16 | 168201202963 |
| 17 | 830252119477 |
| 18 | 4098178655825 |
| 19 | 20228877377719 |
| 20 | 99851059281979 |
| 21 | 492871346862069 |