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 | 8 |
| 4 | 17 |
| 5 | 34 |
| 6 | 73 |
| 7 | 146 |
| 8 | 314 |
| 9 | 628 |
| 10 | 1350 |
| 11 | 2700 |
| 12 | 5798 |
| 13 | 11596 |
| 14 | 24872 |
| 15 | 49744 |
| 16 | 106573 |
| 17 | 213146 |
| 18 | 456169 |
| 19 | 912338 |
| 20 | 1950697 |
| 21 | 3901394 |
| 22 | 8334539 |
| 23 | 16669078 |
| 24 | 35582783 |
| 25 | 71165566 |
| 26 | 151809737 |
| 27 | 303619474 |
| 28 | 647279131 |
| 29 | 1294558262 |
| 30 | 2758310121 |