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 | 7 |
| 3 | 31 |
| 4 | 113 |
| 5 | 223 |
| 6 | 439 |
| 7 | 863 |
| 8 | 6553 |
| 9 | 641449337 |
| 10 | 18837477823 |
| 11 | 40276345611255837298559 |
| 12 | 58893004546665606516457357571 |
| 13 | 9774215601155945008361439560567878777 |