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 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 2 |
| 4 | 4 |
| 5 | 8 |
| 6 | 22 |
| 7 | 44 |
| 8 | 88 |
| 9 | 170 |
| 10 | 340 |
| 11 | 680 |
| 12 | 1366 |
| 13 | 2732 |
| 14 | 5464 |
| 15 | 10922 |
| 16 | 21844 |
| 17 | 43688 |
| 18 | 87382 |
| 19 | 174764 |
| 20 | 349528 |
| 21 | 699050 |
| 22 | 1398100 |
| 23 | 2796200 |
| 24 | 5592406 |
| 25 | 11184812 |
| 26 | 22369624 |
| 27 | 44739242 |