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 | 36 |
| 4 | 276 |
| 5 | 1152 |
| 6 | 3920 |
| 7 | 10568 |
| 8 | 25348 |
| 9 | 53848 |
| 10 | 106292 |
| 11 | 194732 |
| 12 | 339416 |
| 13 | 562652 |
| 14 | 899796 |
| 15 | 1388008 |
| 16 | 2083908 |
| 17 | 3044992 |
| 18 | 4356344 |
| 19 | 6102144 |
| 20 | 8404204 |
| 21 | 11380564 |
| 22 | 15199100 |
| 23 | 20019856 |
| 24 | 26067112 |
| 25 | 33551812 |
| 26 | 42766092 |
| 27 | 53981600 |
| 28 | 67570804 |