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 | 4 |
| 2 | 24 |
| 3 | 108 |
| 4 | 448 |
| 5 | 1812 |
| 6 | 7272 |
| 7 | 29116 |
| 8 | 116496 |
| 9 | 466020 |
| 10 | 1864120 |
| 11 | 7456524 |
| 12 | 29826144 |
| 13 | 119304628 |
| 14 | 477218568 |
| 15 | 1908874332 |
| 16 | 7635497392 |
| 17 | 30541989636 |
| 18 | 122167958616 |
| 19 | 488671834540 |
| 20 | 1954687338240 |
| 21 | 7818749353044 |
| 22 | 31274997412264 |