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 | 1 |
| 2 | 4 |
| 3 | 56 |
| 4 | 2592 |
| 5 | 222850 |
| 6 | 29357385 |
| 7 | 5460708807 |
| 8 | 1360701035812 |
| 9 | 437196618018421 |
| 10 | 175924945354032520 |