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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 7 |
| 7 | 29 |
| 8 | 93 |
| 9 | 256 |
| 10 | 638 |
| 11 | 1486 |
| 12 | 3302 |
| 13 | 7099 |
| 14 | 14913 |
| 15 | 30827 |
| 16 | 63019 |
| 17 | 127858 |
| 18 | 258096 |
| 19 | 519252 |
| 20 | 1042380 |
| 21 | 2089605 |
| 22 | 4185195 |
| 23 | 8377705 |
| 24 | 16764265 |
| 25 | 33539156 |
| 26 | 67090962 |
| 27 | 134196874 |
| 28 | 268411298 |
| 29 | 536843071 |
| 30 | 1073709893 |