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 | 52 |
| 4 | 196 |
| 5 | 932 |
| 6 | 3944 |
| 7 | 14020 |
| 8 | 53556 |
| 9 | 165584 |
| 10 | 507656 |
| 11 | 1251972 |
| 12 | 2988984 |
| 13 | 5904880 |