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 | 5 |
| 2 | 15 |
| 3 | 322 |
| 4 | 4140 |
| 5 | 580479 |
| 6 | 18171918 |
| 7 | 6423148007 |
| 8 | 346212390266 |
| 9 | 232431640956990 |
| 10 | 18633407258171930 |
| 11 | 20538497277155387947 |