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 | 1 |
| 2 | 5 |
| 3 | 7 |
| 4 | 21 |
| 5 | 31 |
| 6 | 123 |
| 7 | 209 |
| 8 | 601 |
| 9 | 971 |
| 10 | 3647 |
| 11 | 6589 |
| 12 | 18565 |
| 13 | 31375 |
| 14 | 114203 |
| 15 | 213073 |
| 16 | 593073 |
| 17 | 1030675 |
| 18 | 3674615 |
| 19 | 6997477 |
| 20 | 19315165 |
| 21 | 34221463 |
| 22 | 120206611 |
| 23 | 232218425 |
| 24 | 637066249 |
| 25 | 1144951835 |
| 26 | 3976689519 |
| 27 | 7765255757 |
| 28 | 21202165941 |
| 29 | 38528688671 |