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 | 3 |
| 2 | 7 |
| 3 | 19 |
| 4 | 43 |
| 5 | 163 |
| 6 | 487 |
| 7 | 1459 |
| 8 | 3079 |
| 9 | 8803 |
| 10 | 39367 |
| 11 | 78787 |
| 12 | 196831 |
| 13 | 581743 |
| 14 | 2125819 |
| 15 | 6381667 |
| 16 | 19131877 |
| 17 | 86093443 |
| 18 | 258280327 |
| 19 | 516560659 |
| 20 | 1214874127 |