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 | 2 |
| 1 | 6 |
| 2 | 16 |
| 3 | 36 |
| 4 | 80 |
| 5 | 164 |
| 6 | 336 |
| 7 | 676 |
| 8 | 1360 |
| 9 | 2732 |
| 10 | 5468 |
| 11 | 10948 |
| 12 | 21904 |
| 13 | 43812 |
| 14 | 87632 |
| 15 | 175276 |
| 16 | 350564 |
| 17 | 701132 |
| 18 | 1402276 |
| 19 | 2804560 |
| 20 | 5609124 |
| 21 | 11218260 |
| 22 | 22436528 |
| 23 | 44873068 |
| 24 | 89746152 |
| 25 | 179492312 |
| 26 | 358984628 |
| 27 | 717969264 |
| 28 | 1435938532 |
| 29 | 2871877072 |