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 | 3 |
| 3 | 15 |
| 4 | 40 |
| 5 | 123 |
| 6 | 516 |
| 7 | 1818 |
| 8 | 7768 |
| 9 | 41048 |
| 10 | 242083 |
| 11 | 1483959 |
| 12 | 10171555 |