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 | 2 |
| 2 | 4 |
| 3 | 12 |
| 4 | 24 |
| 5 | 52 |
| 6 | 144 |
| 7 | 332 |
| 8 | 1104 |
| 9 | 2212 |
| 10 | 4424 |
| 11 | 13252 |
| 12 | 30544 |
| 13 | 101532 |
| 14 | 203504 |
| 15 | 411412 |
| 16 | 1223224 |
| 17 | 2450452 |
| 18 | 5341344 |
| 19 | 15123132 |
| 20 | 34250304 |
| 21 | 112541012 |
| 22 | 225522024 |
| 23 | 455444052 |
| 24 | 1355332144 |
| 25 | 3155104332 |
| 26 | 10354213104 |