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 | 5 |
| 2 | 43 |
| 3 | 2850 |
| 4 | 9380555 |
| 5 | 131539825706327 |
| 6 | 25568462906010064277774504354 |
| 7 | 1702783284378767791750994476557209698496292570221862357616 |
| 8 | 9282809298390896944529722953873240985108041182275536393531898614770319137100914187360035180181565645720539192811580 |