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 | 3 |
| 3 | 39 |
| 4 | 4079 |
| 5 | 5442547 |
| 6 | 135029200594 |
| 7 | 85864898797026630 |
| 8 | 1831628658711424019558504 |
| 9 | 1644974303630818355119787542346815 |
| 10 | 75615488905118998567211473141942014485626339 |