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 | 1 |
| 2 | 5 |
| 3 | 109 |
| 4 | 32297 |
| 5 | 2147321017 |
| 6 | 9223372023970362989 |
| 7 | 170141183460469231667123699502996689125 |
| 8 | 57896044618658097711785492504343953925273862865136528166133547991141168899281 |