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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
| 6 | 6 |
| 7 | 7 |
| 8 | 8 |
| 9 | 9 |
| 10 | 10 |
| 11 | 20 |
| 12 | 30 |
| 13 | 40 |
| 14 | 50 |
| 15 | 60 |
| 16 | 70 |
| 17 | 80 |
| 18 | 90 |
| 19 | 510 |
| 20 | 540 |
| 21 | 810 |
| 22 | 5610 |
| 23 | 5940 |
| 24 | 8712 |
| 25 | 8910 |
| 26 | 9801 |
| 27 | 65340 |
| 28 | 87120 |
| 29 | 87912 |
| 30 | 659340 |
| 31 | 879120 |