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 | 3 |
| 2 | 48 |
| 3 | 2068 |
| 4 | 167625 |
| 5 | 14268351 |
| 6 | 795339012 |
| 7 | 27102769900 |
| 8 | 615440785548 |
| 9 | 10106227864338 |
| 10 | 127441635892627 |
| 11 | 1290114077123683 |
| 12 | 10846768837607450 |
| 13 | 77797729805055016 |
| 14 | 486398599750167133 |
| 15 | 2697872438447793007 |