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 | 3 |
| 2 | 7 |
| 3 | 17 |
| 4 | 40 |
| 5 | 96 |
| 6 | 229 |
| 7 | 547 |
| 8 | 1306 |
| 9 | 3119 |
| 10 | 7448 |
| 11 | 17786 |
| 12 | 42473 |
| 13 | 101426 |
| 14 | 242206 |
| 15 | 578390 |
| 16 | 1381200 |
| 17 | 3298317 |
| 18 | 7876408 |
| 19 | 18808927 |
| 20 | 44915872 |
| 21 | 107259471 |
| 22 | 256136497 |
| 23 | 611656057 |
| 24 | 1460639684 |
| 25 | 3488019553 |
| 26 | 8329419319 |
| 27 | 19890721694 |
| 28 | 47499206650 |