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 | 2 |
| 3 | 4 |
| 4 | 9 |
| 5 | 20 |
| 6 | 45 |
| 7 | 100 |
| 8 | 220 |
| 9 | 478 |
| 10 | 1025 |
| 11 | 2169 |
| 12 | 4534 |
| 13 | 9364 |
| 14 | 19125 |
| 15 | 38646 |
| 16 | 77306 |
| 17 | 153173 |
| 18 | 300765 |
| 19 | 585518 |
| 20 | 1130612 |
| 21 | 2166284 |
| 22 | 4120062 |
| 23 | 7780817 |
| 24 | 14595364 |
| 25 | 27201794 |
| 26 | 50383690 |
| 27 | 92768457 |
| 28 | 169835952 |
| 29 | 309223286 |
| 30 | 560036477 |
| 31 | 1009124256 |