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 | 4 |
| 2 | 6 |
| 3 | 12 |
| 4 | 24 |
| 5 | 48 |
| 6 | 95 |
| 7 | 190 |
| 8 | 380 |
| 9 | 760 |
| 10 | 1520 |
| 11 | 3040 |
| 12 | 6080 |
| 13 | 12160 |
| 14 | 24320 |
| 15 | 48640 |
| 16 | 97280 |
| 17 | 194560 |
| 18 | 389120 |
| 19 | 778240 |
| 20 | 1556480 |
| 21 | 3112960 |
| 22 | 6225920 |
| 23 | 12451840 |
| 24 | 24903680 |
| 25 | 49807360 |
| 26 | 99614720 |
| 27 | 199229440 |
| 28 | 398458880 |
| 29 | 796917760 |
| 30 | 1593835520 |
| 31 | 3187671040 |