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 | 40 |
| 4 | 118 |
| 5 | 358 |
| 6 | 936 |
| 7 | 2600 |
| 8 | 6212 |
| 9 | 16068 |
| 10 | 34936 |
| 11 | 83708 |
| 12 | 163452 |
| 13 | 357056 |
| 14 | 613592 |
| 15 | 1205716 |
| 16 | 1770616 |
| 17 | 3073480 |
| 18 | 3715920 |
| 19 | 5573480 |
| 20 | 5255048 |
| 21 | 6591160 |
| 22 | 4353912 |
| 23 | 4330096 |
| 24 | 1513712 |
| 25 | 1061392 |
| 26 | 0 |