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 | 10 |
| 3 | 44 |
| 4 | 2336 |
| 5 | 8896 |
| 6 | 34432 |
| 7 | 449295 |
| 8 | 549775212544 |
| 9 | 2251801457852416 |
| 10 | 9007202677293056 |
| 11 | 9223372167851278336 |
| 12 | 20055918935605248255 |