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 | 5 |
| 3 | 42 |
| 4 | 632 |
| 5 | 14124 |
| 6 | 449652 |
| 7 | 19200336 |
| 8 | 1063272704 |
| 9 | 74068997888 |
| 10 | 6344884818304 |
| 11 | 655635015988864 |
| 12 | 80447681129070080 |
| 13 | 11565193558509497088 |
| 14 | 1925787312858332101888 |
| 15 | 367762470538537620457472 |
| 16 | 79847718328265949957881856 |
| 17 | 19560087897336150724249288704 |