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 | 2 |
| 2 | 5 |
| 3 | 10 |
| 4 | 17 |
| 5 | 28 |
| 6 | 41 |
| 7 | 58 |
| 8 | 95 |
| 9 | 174 |
| 10 | 287 |
| 11 | 484 |
| 12 | 683 |
| 13 | 1020 |
| 14 | 2213 |
| 15 | 5992 |
| 16 | 17931 |
| 17 | 37868 |
| 18 | 231807 |
| 19 | 431740 |
| 20 | 1111111111111542851 |
| 21 | 11112222222222222653962 |