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 | 3 |
| 2 | 4 |
| 3 | 8 |
| 4 | 24 |
| 5 | 74 |
| 6 | 444 |
| 7 | 1600 |
| 8 | 15684 |
| 9 | 29400 |
| 10 | 50124 |
| 11 | 259224 |
| 12 | 5332128 |
| 13 | 11110428 |
| 14 | 50395440 |
| 15 | 451174728 |
| 16 | 1296895890 |
| 17 | 13314115434 |
| 18 | 32868437466 |
| 19 | 326585290794 |
| 20 | 4788143252148 |