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 | 13 |
| 2 | 21 |
| 3 | 44 |
| 4 | 56 |
| 5 | 100 |
| 6 | 108 |
| 7 | 270 |
| 8 | 450 |
| 9 | 560 |
| 10 | 576 |
| 11 | 600 |
| 12 | 1584 |
| 13 | 1848 |
| 14 | 2100 |
| 15 | 3240 |
| 16 | 4320 |
| 17 | 9072 |
| 18 | 9900 |
| 19 | 11088 |
| 20 | 14040 |
| 21 | 16800 |
| 22 | 28080 |
| 23 | 39600 |
| 24 | 40320 |
| 25 | 80640 |
| 26 | 92400 |
| 27 | 141120 |
| 28 | 143640 |
| 29 | 171360 |
| 30 | 287280 |
| 31 | 383040 |
| 32 | 453600 |
| 33 | 471240 |
| 34 | 900900 |
| 35 | 1028160 |
| 36 | 1053360 |
| 37 | 1670760 |
| 38 | 1995840 |
| 39 | 2106720 |