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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 26 |
| 5 | 94 |
| 6 | 330 |
| 7 | 1178 |
| 8 | 4186 |
| 9 | 14914 |
| 10 | 53098 |
| 11 | 189122 |
| 12 | 673530 |
| 13 | 2398834 |
| 14 | 8543498 |
| 15 | 30428162 |
| 16 | 108371354 |
| 17 | 385970386 |
| 18 | 1374653610 |
| 19 | 4895901602 |
| 20 | 17437011514 |
| 21 | 62102837746 |
| 22 | 221182535242 |
| 23 | 787753281218 |
| 24 | 2805624912090 |
| 25 | 9992381298706 |
| 26 | 35588393716202 |