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) |
|---|---|
| 6 | 2 |
| 7 | 12 |
| 8 | 56 |
| 9 | 224 |
| 10 | 806 |
| 11 | 2688 |
| 12 | 8448 |
| 13 | 25344 |
| 14 | 73216 |
| 15 | 205004 |
| 16 | 559104 |
| 17 | 1490944 |
| 18 | 3899392 |
| 19 | 10027008 |
| 20 | 25401752 |
| 21 | 63504384 |
| 22 | 156893184 |
| 23 | 383516672 |
| 24 | 928514048 |
| 25 | 2228433712 |
| 26 | 5305794560 |
| 27 | 12540968960 |
| 28 | 29444014080 |
| 29 | 68702699520 |
| 30 | 159390262880 |