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 | 44 |
| 4 | 2828 |
| 5 | 564468 |
| 6 | 754425400 |
| 7 | 3079904455096 |
| 8 | 88444819222239178 |
| 9 | 7685637690960745082050 |
| 10 | 4793315937811919497089287562 |