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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 117 |
| 4 | 1989 |
| 5 | 41709 |
| 6 | 1038975 |
| 7 | 29947185 |
| 8 | 979687005 |
| 9 | 35839643175 |
| 10 | 1449091813035 |
| 11 | 64144495494825 |
| 12 | 3084209792570721 |
| 13 | 160023238477245789 |
| 14 | 8909102551102555002 |
| 15 | 529651263967161225648 |
| 16 | 33482356679629151295651 |