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 | 6 |
| 3 | 57 |
| 4 | 1470 |
| 5 | 82918 |
| 6 | 7194272 |
| 7 | 664545445 |
| 8 | 57778060974 |
| 9 | 4570181600483 |
| 10 | 327615878641570 |
| 11 | 21381615692198496 |
| 12 | 1278652375557906920 |
| 13 | 70509371505314767968 |
| 14 | 3605811115784411350607 |