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 | 9 |
| 2 | 141 |
| 3 | 2893 |
| 4 | 73081 |
| 5 | 2200977 |
| 6 | 77189509 |
| 7 | 3095295861 |
| 8 | 139872233073 |
| 9 | 7039013063065 |
| 10 | 390656716635901 |
| 11 | 23714578436644509 |
| 12 | 1563646420268423401 |
| 13 | 111315499088924632353 |
| 14 | 8511391223995285616373 |
| 15 | 695805743909499121660357 |