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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 13 |
| 5 | 4 |
| 6 | 98 |
| 7 | 57 |
| 8 | 511 |
| 9 | 499 |
| 10 | 3722 |
| 11 | 3845 |
| 12 | 24823 |
| 13 | 31696 |
| 14 | 164781 |
| 15 | 243930 |
| 16 | 1134938 |
| 17 | 1847197 |
| 18 | 7765162 |
| 19 | 13890389 |
| 20 | 53540736 |
| 21 | 102899049 |
| 22 | 371688482 |
| 23 | 756873240 |
| 24 | 2587867543 |
| 25 | 5533483651 |
| 26 | 18092417136 |
| 27 | 40238855115 |
| 28 | 126887317089 |
| 29 | 291501063966 |
| 30 | 892138812087 |