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 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 19 |
| 4 | 59 |
| 5 | 161 |
| 6 | 405 |
| 7 | 967 |
| 8 | 2231 |
| 9 | 5029 |
| 10 | 11153 |
| 11 | 24443 |
| 12 | 53091 |
| 13 | 114505 |
| 14 | 245549 |
| 15 | 524047 |
| 16 | 1113839 |
| 17 | 2358989 |
| 18 | 4980393 |
| 19 | 10485379 |
| 20 | 22019675 |
| 21 | 46136881 |
| 22 | 96468485 |
| 23 | 201326039 |
| 24 | 419429799 |
| 25 | 872414581 |
| 26 | 1811938625 |
| 27 | 3758095627 |
| 28 | 7784627411 |