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 | 0 |
| 2 | 15 |
| 3 | 10 |
| 4 | 120 |
| 5 | 156 |
| 6 | 760 |
| 7 | 1350 |
| 8 | 4350 |
| 9 | 8770 |
| 10 | 22896 |
| 11 | 47610 |
| 12 | 110110 |
| 13 | 226260 |
| 14 | 483180 |
| 15 | 964696 |