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 | 4 |
| 2 | 581 |
| 3 | 427 |
| 4 | 8621 |
| 5 | 16342 |
| 6 | 253486367 |
| 7 | 2219057821 |
| 8 | 27297112754 |
| 9 | 89359826467 |
| 10 | 111725421271 |
| 11 | 81491456587747 |
| 12 | 65683774724947682 |
| 13 | 3657883767310690921 |
| 14 | 324958155565178050832783011 |
| 15 | 7599185976546928443534740942821 |
| 16 | 3638796960899657009455220564046301 |