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 | 8 |
| 4 | 16 |
| 5 | 24 |
| 6 | 48 |
| 7 | 80 |
| 8 | 160 |
| 9 | 320 |
| 10 | 640 |
| 11 | 1280 |
| 12 | 2560 |
| 13 | 3840 |
| 14 | 7680 |
| 15 | 15360 |
| 16 | 30720 |
| 17 | 61440 |
| 18 | 122880 |
| 19 | 184320 |
| 20 | 368640 |
| 21 | 737280 |
| 22 | 1474560 |
| 23 | 2949120 |
| 24 | 5898240 |
| 25 | 11796480 |
| 26 | 23592960 |
| 27 | 47185920 |
| 28 | 94371840 |
| 29 | 188743680 |
| 30 | 377487360 |
| 31 | 566231040 |