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 | 7 |
| 4 | 16 |
| 5 | 30 |
| 6 | 63 |
| 7 | 121 |
| 8 | 239 |
| 9 | 484 |
| 10 | 981 |
| 11 | 1960 |
| 12 | 3931 |
| 13 | 7897 |
| 14 | 15819 |
| 15 | 31728 |
| 16 | 63575 |
| 17 | 127353 |
| 18 | 255161 |
| 19 | 511013 |
| 20 | 1023397 |
| 21 | 2049131 |
| 22 | 4102600 |
| 23 | 8213243 |