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 | 12 |
| 2 | 26208 |
| 3 | 9726417792 |
| 4 | 610296923230525440 |
| 5 | 6471875909051511775903457280 |
| 6 | 11598637276362103019770723830073032376320 |
| 7 | 3512938445418644176053176560741858449740612202579886080 |