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 | 3 |
| 1 | 5 |
| 2 | 10 |
| 3 | 21 |
| 4 | 42 |
| 5 | 84 |
| 6 | 168 |
| 7 | 335 |
| 8 | 670 |
| 9 | 1340 |
| 10 | 2681 |
| 11 | 5362 |
| 12 | 10723 |
| 13 | 21447 |
| 14 | 42894 |
| 15 | 85788 |
| 16 | 171575 |
| 17 | 343151 |
| 18 | 686302 |
| 19 | 1372604 |
| 20 | 2745208 |
| 21 | 5490415 |
| 22 | 10980830 |
| 23 | 21961661 |
| 24 | 43923322 |
| 25 | 87846643 |
| 26 | 175693287 |
| 27 | 351386574 |
| 28 | 702773148 |
| 29 | 1405546295 |
| 30 | 2811092590 |
| 31 | 5622185181 |
| 32 | 11244370361 |