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 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 23 |
| 5 | 63 |
| 6 | 172 |
| 7 | 471 |
| 8 | 1287 |
| 9 | 3516 |
| 10 | 9607 |
| 11 | 26247 |
| 12 | 71708 |
| 13 | 195911 |
| 14 | 535239 |
| 15 | 1462300 |
| 16 | 3995079 |
| 17 | 10914759 |
| 18 | 29819676 |
| 19 | 81468871 |
| 20 | 222577095 |
| 21 | 608091932 |
| 22 | 1661338055 |
| 23 | 4538859975 |
| 24 | 12400396060 |
| 25 | 33878512071 |
| 26 | 92557816263 |
| 27 | 252872656668 |