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 | 3 |
| 2 | 7 |
| 3 | 16 |
| 4 | 34 |
| 5 | 75 |
| 6 | 157 |
| 7 | 345 |
| 8 | 721 |
| 9 | 1588 |
| 10 | 3322 |
| 11 | 7342 |
| 12 | 15382 |
| 13 | 34117 |
| 14 | 71587 |
| 15 | 159322 |
| 16 | 334792 |
| 17 | 747507 |
| 18 | 1572937 |
| 19 | 3522561 |
| 20 | 7421809 |
| 21 | 16667530 |
| 22 | 35158972 |
| 23 | 79162689 |
| 24 | 167170123 |
| 25 | 377291856 |
| 26 | 797535322 |
| 27 | 1803925336 |
| 28 | 3816705364 |