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 | 4 |
| 3 | 11 |
| 4 | 40 |
| 5 | 122 |
| 6 | 410 |
| 7 | 1270 |
| 8 | 3888 |
| 9 | 11230 |
| 10 | 31169 |
| 11 | 82234 |
| 12 | 208068 |
| 13 | 504148 |
| 14 | 1175882 |
| 15 | 2643952 |
| 16 | 5751108 |
| 17 | 12125574 |
| 18 | 24845786 |
| 19 | 49567350 |
| 20 | 96475743 |
| 21 | 183489050 |
| 22 | 341565932 |
| 23 | 623152106 |
| 24 | 1115673576 |
| 25 | 1962423333 |
| 26 | 3394902381 |
| 27 | 5781655379 |