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 | 0 |
| 1 | 6 |
| 2 | 108 |
| 3 | 2598 |
| 4 | 123750 |
| 5 | 12994248 |
| 6 | 3114709914 |
| 7 | 1730766715308 |
| 8 | 2248937669398650 |
| 9 | 6877862090075063484 |
| 10 | 49790967547432817528562 |
| 11 | 857275977287938332061154856 |
| 12 | 35233501393224883314185777947590 |