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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 193 |
| 8 | 2072 |
| 9 | 12048 |
| 10 | 50400 |
| 11 | 169950 |
| 12 | 490776 |
| 13 | 1261308 |
| 14 | 2949264 |
| 15 | 6403947 |
| 16 | 13033792 |
| 17 | 25196840 |
| 18 | 46452864 |
| 19 | 82463460 |
| 20 | 141145632 |
| 21 | 234641712 |
| 22 | 379035984 |