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 | 4 |
| 1 | 4 |
| 2 | 6 |
| 3 | 24 |
| 4 | 60 |
| 5 | 144 |
| 6 | 360 |
| 7 | 852 |
| 8 | 1968 |
| 9 | 4488 |
| 10 | 10068 |
| 11 | 22272 |
| 12 | 48780 |
| 13 | 105948 |
| 14 | 228588 |
| 15 | 490404 |
| 16 | 1046976 |
| 17 | 2225964 |
| 18 | 4715400 |
| 19 | 9956976 |
| 20 | 20965212 |
| 21 | 44031360 |
| 22 | 92262348 |
| 23 | 192920784 |
| 24 | 402629256 |
| 25 | 838827576 |
| 26 | 1744784388 |
| 27 | 3623814864 |
| 28 | 7516104564 |