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 | 2 |
| 2 | 2 |
| 3 | 2 |
| 4 | 19 |
| 5 | 113 |
| 6 | 509 |
| 7 | 2551 |
| 8 | 19267 |
| 9 | 75041 |
| 10 | 753143 |
| 11 | 4310819 |
| 12 | 38238461 |
| 13 | 307379717 |
| 14 | 805592213 |
| 15 | 13341291553 |