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) |
|---|---|
| 2 | 4 |
| 3 | 64 |
| 4 | 1494 |
| 5 | 220578 |
| 6 | 4527796 |
| 7 | 36623052 |
| 8 | 184894958 |
| 9 | 703103262 |
| 10 | 2210412872 |
| 11 | 6056277794 |
| 12 | 14944420486 |
| 13 | 33946657490 |