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 | 1 |
| 3 | 4 |
| 4 | 29 |
| 5 | 2265 |
| 6 | 18698645 |
| 7 | 1602308616574727 |
| 8 | 14017675267522095175220940844027 |
| 9 | 1245902734717669791621141496863001384336371908521990690157218737 |