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 | 4 |
| 2 | 12 |
| 3 | 36 |
| 4 | 100 |
| 5 | 276 |
| 6 | 740 |
| 7 | 1972 |
| 8 | 5172 |
| 9 | 13492 |
| 10 | 34876 |
| 11 | 89764 |
| 12 | 229628 |
| 13 | 585508 |
| 14 | 1486308 |
| 15 | 3763460 |
| 16 | 9497380 |
| 17 | 23918708 |
| 18 | 60080156 |
| 19 | 150660388 |
| 20 | 377009364 |
| 21 | 942106116 |
| 22 | 2350157268 |
| 23 | 5855734740 |
| 24 | 14569318492 |
| 25 | 36212402548 |
| 26 | 89896870204 |