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) |
---|---|
1 | 4 |
2 | 216 |
3 | 24883200000 |
4 | 82606411253903523840000000 |
5 | 409933016554924328182440935903164918932547530146724293451448320000000000000000000000 |