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 | 36 |
| 3 | 660 |
| 4 | 23554 |
| 5 | 1602092 |
| 6 | 205613460 |
| 7 | 49555044358 |
| 8 | 22380167899116 |
| 9 | 18924317057007778 |
| 10 | 29956465204908956664 |
| 11 | 88786379727557659524194 |