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 | 4 |
| 2 | 34 |
| 3 | 412 |
| 4 | 6325 |
| 5 | 116372 |
| 6 | 2483706 |
| 7 | 60168736 |
| 8 | 1628677692 |
| 9 | 48672911296 |
| 10 | 1590752204044 |
| 11 | 56418074957840 |
| 12 | 2157411204773415 |
| 13 | 88464995576660084 |
| 14 | 3871611011946560294 |
| 15 | 180101399407072883012 |
| 16 | 8873328068327122625596 |