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) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 8 |
| 4 | 18 |
| 5 | 130 |
| 6 | 2206 |
| 7 | 4326 |
| 8 | 4650 |
| 9 | 16344 |
| 10 | 16814 |
| 11 | 47942 |
| 12 | 48000 |
| 13 | 49928 |