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 | 128 |
| 3 | 16384 |
| 4 | 4456448 |
| 5 | 2080374784 |
| 6 | 1483911200768 |
| 7 | 1501108249821184 |
| 8 | 2044143848640217088 |
| 9 | 3605459138582973251584 |
| 10 | 7995891855149741436305408 |
| 11 | 21776918737280678860353961984 |
| 12 | 71454103701490016776039304265728 |
| 13 | 278008871543597996197497752082448384 |