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 | 7 |
| 3 | 1734 |
| 4 | 89521056 |
| 5 | 1241763995193675 |
| 6 | 7162795001695681351632672 |
| 7 | 25488450150907292192918677242007992558 |
| 8 | 77841043345568973636021269757801814299054870565039692 |