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 | 4 |
| 2 | 28 |
| 3 | 524 |
| 4 | 29804 |
| 5 | 5423660 |
| 6 | 3276048300 |
| 7 | 6744720496300 |
| 8 | 48290009081437356 |
| 9 | 1221415413140406958252 |
| 10 | 110523986015743458745929900 |
| 11 | 36150734459755630877180158951596 |