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 | 5 |
| 2 | 13 |
| 3 | 42 |
| 4 | 157 |
| 5 | 625 |
| 6 | 2605 |
| 7 | 11161 |
| 8 | 48829 |
| 9 | 217014 |
| 10 | 976563 |
| 11 | 4438921 |
| 12 | 20345053 |
| 13 | 93900241 |
| 14 | 435965402 |
| 15 | 2034505209 |
| 16 | 9536743165 |
| 17 | 44878791361 |
| 18 | 211927625869 |
| 19 | 1003867701481 |
| 20 | 4768371582032 |
| 21 | 22706531343006 |
| 22 | 108372081409802 |