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 | 2 |
| 2 | 4 |
| 3 | 6 |
| 4 | 12 |
| 5 | 20 |
| 6 | 30 |
| 7 | 60 |
| 8 | 84 |
| 9 | 168 |
| 10 | 336 |
| 11 | 528 |
| 12 | 880 |
| 13 | 1320 |
| 14 | 2640 |
| 15 | 5280 |
| 16 | 10560 |
| 17 | 12480 |
| 18 | 24960 |
| 19 | 49920 |
| 20 | 74880 |
| 21 | 104832 |
| 22 | 209664 |
| 23 | 419328 |
| 24 | 838656 |
| 25 | 1096704 |
| 26 | 2193408 |
| 27 | 4386816 |
| 28 | 8773632 |
| 29 | 14622720 |
| 30 | 29245440 |
| 31 | 58490880 |
| 32 | 116981760 |
| 33 | 233963520 |
| 34 | 350945280 |
| 35 | 701890560 |
| 36 | 784465920 |
| 37 | 1568931840 |
| 38 | 2465464320 |
| 39 | 4930928640 |
| 40 | 9861857280 |
| 41 | 14792785920 |