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 | 3025 |
| 3 | 441720 |
| 4 | 367565584 |
| 5 | 142283547000 |
| 6 | 71306050492681 |
| 7 | 31835526389622592 |
| 8 | 14864426276052147876 |