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 | 36 |
| 3 | 744 |
| 4 | 28536 |
| 5 | 1736064 |
| 6 | 152914176 |
| 7 | 18372559104 |
| 8 | 2885671339776 |
| 9 | 573765893121024 |
| 10 | 140835811776316416 |
| 11 | 41820352964911908864 |
| 12 | 14774712204104658671616 |
| 13 | 6124078747943873540112384 |