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 | 10 |
| 3 | 41 |
| 4 | 168 |
| 5 | 8359 |
| 6 | 139430 |
| 7 | 663717 |
| 8 | 2148147364 |
| 9 | 2305843011361841315 |
| 10 | 618970021948533148811403426 |
| 11 | 162259895799235311924726821691553 |
| 12 | 170141345720365030966999228442705797280 |