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 | 4 |
| 2 | 12 |
| 3 | 80 |
| 4 | 304 |
| 5 | 2176 |
| 6 | 8832 |
| 7 | 64768 |
| 8 | 271104 |
| 9 | 2013184 |
| 10 | 8579072 |
| 11 | 64200704 |
| 12 | 276815872 |
| 13 | 2082406400 |
| 14 | 9053405184 |
| 15 | 68364861440 |
| 16 | 299056168960 |
| 17 | 2264753766400 |
| 18 | 9954207989760 |
| 19 | 75553161871360 |
| 20 | 333336432082944 |
| 21 | 2534637351993344 |
| 22 | 11217239353065472 |
| 23 | 85421341058007040 |
| 24 | 379009013460762624 |