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 | 9 |
| 2 | 19 |
| 3 | 90 |
| 4 | 27 |
| 5 | 90 |
| 6 | 180 |
| 7 | 819 |
| 8 | 36 |
| 9 | 90 |
| 10 | 180 |
| 11 | 738 |
| 12 | 270 |
| 13 | 738 |
| 14 | 1638 |
| 15 | 7641 |
| 16 | 45 |
| 17 | 90 |
| 18 | 180 |
| 19 | 738 |
| 20 | 270 |
| 21 | 819 |
| 22 | 1476 |
| 23 | 6570 |
| 24 | 360 |
| 25 | 738 |
| 26 | 1476 |
| 27 | 6732 |
| 28 | 2457 |
| 29 | 6570 |
| 30 | 14922 |
| 31 | 67968 |