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 | 3 |
| 2 | 34 |
| 3 | 654 |
| 4 | 17688 |
| 5 | 616120 |
| 6 | 26252496 |
| 7 | 1322624016 |
| 8 | 76909665664 |
| 9 | 5069558461824 |
| 10 | 373529452588800 |
| 11 | 30422117430022912 |
| 12 | 2713911389090970624 |
| 13 | 263171888496899625984 |
| 14 | 27563036166079327578112 |
| 15 | 3100736138961250867968000 |
| 16 | 372888702864658105915244544 |