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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 3 |
| 5 | 6 |
| 6 | 10 |
| 7 | 20 |
| 8 | 46 |
| 9 | 226 |
| 10 | 1836 |
| 11 | 3719 |
| 12 | 14308 |
| 13 | 17262 |
| 14 | 129530 |
| 15 | 945152 |
| 16 | 1535786 |
| 17 | 2229882 |
| 18 | 3560447 |
| 19 | 9434930 |
| 20 | 20957352 |
| 21 | 102311436 |
| 22 | 312567415 |
| 23 | 449243761 |
| 24 | 4362956254 |
| 25 | 12000988888 |
| 26 | 22909186976 |
| 27 | 29969826721 |