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) |
|---|---|
| 3 | 13 |
| 4 | 505 |
| 5 | 3991681 |
| 6 | 622702081 |
| 7 | 35568742809601 |
| 8 | 12164510040883201 |
| 9 | 2585201673888497664001 |
| 10 | 884176199373970195454361600001 |
| 11 | 822283865417792281772556288000001 |