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 | 2 |
| 3 | 5 |
| 4 | 18 |
| 5 | 523 |
| 6 | 44884 |
| 7 | 227838935 |
| 8 | 1086696880188 |
| 9 | 1566338449874827101 |
| 10 | 694432397394116143569646 |