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 | 4 |
| 2 | 25 |
| 3 | 199 |
| 4 | 1936 |
| 5 | 22411 |
| 6 | 301939 |
| 7 | 4649800 |
| 8 | 80654599 |
| 9 | 1556992441 |
| 10 | 33120019516 |
| 11 | 769887934729 |
| 12 | 19419368959225 |
| 13 | 528311452144204 |
| 14 | 15421347559288441 |
| 15 | 480784227676809991 |
| 16 | 15945180393017896024 |
| 17 | 560549114426134288675 |