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 | 4 |
| 3 | 9 |
| 4 | 24 |
| 5 | 72 |
| 6 | 224 |
| 7 | 688 |
| 8 | 2048 |
| 9 | 5888 |
| 10 | 16384 |
| 11 | 44288 |
| 12 | 116736 |
| 13 | 301056 |
| 14 | 761856 |
| 15 | 1896448 |
| 16 | 4653056 |
| 17 | 11272192 |
| 18 | 27000832 |
| 19 | 64028672 |
| 20 | 150470656 |
| 21 | 350748672 |
| 22 | 811597824 |
| 23 | 1865416704 |
| 24 | 4261412864 |
| 25 | 9680453632 |
| 26 | 21877489664 |
| 27 | 49207574528 |