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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 73 |
| 4 | 1952 |
| 5 | 208559 |
| 6 | 34974844 |
| 7 | 12713143876 |
| 8 | 10031326473244 |
| 9 | 16844842566734425 |
| 10 | 61957626701788646084 |
| 11 | 497581272671041376917187 |