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 | 9 |
| 2 | 26 |
| 3 | 68 |
| 4 | 169 |
| 5 | 413 |
| 6 | 1002 |
| 7 | 2424 |
| 8 | 5857 |
| 9 | 14145 |
| 10 | 34154 |
| 11 | 82460 |
| 12 | 199081 |
| 13 | 480629 |
| 14 | 1160346 |
| 15 | 2801328 |
| 16 | 6763009 |
| 17 | 16327353 |
| 18 | 39417722 |
| 19 | 95162804 |
| 20 | 229743337 |
| 21 | 554649485 |
| 22 | 1339042314 |
| 23 | 3232734120 |
| 24 | 7804510561 |
| 25 | 18841755249 |
| 26 | 45488021066 |
| 27 | 109817797388 |
| 28 | 265123615849 |