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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 20 |
| 7 | 48 |
| 8 | 115 |
| 9 | 286 |
| 10 | 718 |
| 11 | 1832 |
| 12 | 4702 |
| 13 | 12159 |
| 14 | 31515 |
| 15 | 81888 |
| 16 | 212878 |
| 17 | 553557 |
| 18 | 1438741 |
| 19 | 3737331 |
| 20 | 9700188 |
| 21 | 25156049 |
| 22 | 65181067 |
| 23 | 168746672 |
| 24 | 436505846 |
| 25 | 1128256918 |
| 26 | 2914103577 |
| 27 | 7521450053 |
| 28 | 19400577711 |
| 29 | 50010551503 |
| 30 | 128841990772 |
| 31 | 331754004302 |