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) |
|---|---|
| 0 | 4 |
| 1 | 12 |
| 2 | 24 |
| 3 | 48 |
| 4 | 96 |
| 5 | 196 |
| 6 | 392 |
| 7 | 784 |
| 8 | 1568 |
| 9 | 3140 |
| 10 | 6280 |
| 11 | 12560 |
| 12 | 25120 |
| 13 | 50244 |
| 14 | 100488 |
| 15 | 200976 |
| 16 | 401952 |
| 17 | 803908 |
| 18 | 1607816 |
| 19 | 3215632 |
| 20 | 6431264 |
| 21 | 12862532 |
| 22 | 25725064 |
| 23 | 51450128 |
| 24 | 102900256 |
| 25 | 205800516 |
| 26 | 411601032 |
| 27 | 823202064 |
| 28 | 1646404128 |
| 29 | 3292808260 |