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 | 1 |
| 2 | 7 |
| 3 | 421 |
| 4 | 10375 |
| 5 | 1864921 |
| 6 | 177588115 |
| 7 | 43788506581 |
| 8 | 5364386887855 |
| 9 | 3746015060385841 |
| 10 | 743097477083711275 |
| 11 | 562069712763196977901 |
| 12 | 208700966175150043937095 |
| 13 | 201649817635812110915892361 |
| 14 | 89621739407126401163202051715 |
| 15 | 158792595367325562826629059282821 |