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 | 0 |
| 1 | 3 |
| 2 | 14 |
| 3 | 48 |
| 4 | 144 |
| 5 | 400 |
| 6 | 1056 |
| 7 | 2688 |
| 8 | 6656 |
| 9 | 16128 |
| 10 | 38400 |
| 11 | 90112 |
| 12 | 208896 |
| 13 | 479232 |
| 14 | 1089536 |
| 15 | 2457600 |
| 16 | 5505024 |
| 17 | 12255232 |
| 18 | 27131904 |
| 19 | 59768832 |
| 20 | 131072000 |
| 21 | 286261248 |
| 22 | 622854144 |
| 23 | 1350565888 |
| 24 | 2919235584 |
| 25 | 6291456000 |
| 26 | 13522436096 |