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 | 268 |
| 2 | 556 |
| 3 | 1132 |
| 4 | 2284 |
| 5 | 4588 |
| 6 | 9196 |
| 7 | 18412 |
| 8 | 36844 |
| 9 | 73708 |
| 10 | 147436 |
| 11 | 294892 |
| 12 | 589804 |
| 13 | 1179628 |
| 14 | 2359276 |
| 15 | 4718572 |
| 16 | 9437164 |
| 17 | 18874348 |
| 18 | 37748716 |
| 19 | 75497452 |
| 20 | 150994924 |
| 21 | 301989868 |
| 22 | 603979756 |
| 23 | 1207959532 |
| 24 | 2415919084 |
| 25 | 4831838188 |
| 26 | 9663676396 |
| 27 | 19327352812 |
| 28 | 38654705644 |
| 29 | 77309411308 |