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 | 6 |
| 3 | 12 |
| 4 | 26 |
| 5 | 52 |
| 6 | 106 |
| 7 | 212 |
| 8 | 426 |
| 9 | 852 |
| 10 | 1706 |
| 11 | 3412 |
| 12 | 6826 |
| 13 | 13652 |
| 14 | 27306 |
| 15 | 54612 |
| 16 | 109226 |
| 17 | 218452 |
| 18 | 436906 |
| 19 | 873812 |
| 20 | 1747626 |
| 21 | 3495252 |
| 22 | 6990506 |
| 23 | 13981012 |
| 24 | 27962026 |
| 25 | 55924052 |
| 26 | 111848106 |
| 27 | 223696212 |
| 28 | 447392426 |
| 29 | 894784852 |
| 30 | 1789569706 |
| 31 | 3579139412 |