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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 41 |
| 6 | 121 |
| 7 | 356 |
| 8 | 1044 |
| 9 | 3057 |
| 10 | 8948 |
| 11 | 26192 |
| 12 | 76674 |
| 13 | 224465 |
| 14 | 657137 |
| 15 | 1923817 |
| 16 | 5632105 |
| 17 | 16488346 |
| 18 | 48270655 |
| 19 | 141315320 |
| 20 | 413709331 |
| 21 | 1211159679 |
| 22 | 3545745012 |
| 23 | 10380388294 |
| 24 | 30389230117 |
| 25 | 88966354626 |
| 26 | 260454516946 |
| 27 | 762496740130 |