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 | 10 |
| 2 | 20 |
| 3 | 40 |
| 4 | 50 |
| 5 | 80 |
| 6 | 210 |
| 7 | 420 |
| 8 | 630 |
| 9 | 711 |
| 10 | 831 |
| 11 | 840 |
| 12 | 2910 |
| 13 | 29910 |
| 14 | 40320 |
| 15 | 80640 |
| 16 | 98361 |
| 17 | 673140 |
| 18 | 865580 |
| 19 | 8656341 |
| 20 | 466760130 |
| 21 | 694602930 |
| 22 | 821412711 |
| 23 | 23465346510 |
| 24 | 40396039620 |
| 25 | 63130473930 |
| 26 | 234000006510 |
| 27 | 464205665820 |
| 28 | 2340653406510 |
| 29 | 2346599346510 |