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 | 36 |
| 3 | 308 |
| 4 | 2764 |
| 5 | 25404 |
| 6 | 237164 |
| 7 | 2237948 |
| 8 | 21286548 |
| 9 | 203701772 |
| 10 | 1958748676 |
| 11 | 18908954324 |
| 12 | 183135542956 |
| 13 | 1778581016076 |
| 14 | 17314029758828 |
| 15 | 168891863875652 |