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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 61 |
| 4 | 117874 |
| 5 | 33219689231 |
| 6 | 2559960025059106420 |
| 7 | 85975912953927216830024650654 |
| 8 | 1841153609473379088124269084031755459049386 |