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 | 8 |
| 2 | 48 |
| 3 | 255 |
| 4 | 1310 |
| 5 | 6773 |
| 6 | 35260 |
| 7 | 183740 |
| 8 | 956765 |
| 9 | 4980320 |
| 10 | 25924725 |
| 11 | 134956612 |
| 12 | 702554244 |
| 13 | 3657326875 |
| 14 | 19039098206 |
| 15 | 99112598721 |
| 16 | 515954630808 |
| 17 | 2685927132776 |
| 18 | 13982245762937 |
| 19 | 72787973059648 |
| 20 | 378915453775913 |
| 21 | 1972536332660240 |
| 22 | 10268516498713448 |