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 | 2 |
| 2 | 4 |
| 3 | 10 |
| 4 | 30 |
| 5 | 94 |
| 6 | 316 |
| 7 | 1096 |
| 8 | 3856 |
| 9 | 13798 |
| 10 | 49940 |
| 11 | 182362 |
| 12 | 671092 |
| 13 | 2485534 |
| 14 | 9256396 |
| 15 | 34636834 |
| 16 | 130150588 |
| 17 | 490853416 |
| 18 | 1857283156 |
| 19 | 7048151672 |
| 20 | 26817356776 |
| 21 | 102280151422 |
| 22 | 390937468408 |
| 23 | 1497207322930 |
| 24 | 5744387279818 |
| 25 | 22076468764192 |