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 | 3 |
| 2 | 2 |
| 3 | 13 |
| 4 | 18 |
| 5 | 8 |
| 6 | 75 |
| 7 | 158 |
| 8 | 144 |
| 9 | 48 |
| 10 | 541 |
| 11 | 1530 |
| 12 | 2120 |
| 13 | 1440 |
| 14 | 384 |
| 15 | 4683 |
| 16 | 16622 |
| 17 | 30960 |
| 18 | 31920 |
| 19 | 17280 |
| 20 | 3840 |