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) |
|---|---|
| 2 | 3 |
| 3 | 31 |
| 4 | 97 |
| 5 | 331 |
| 6 | 1009 |
| 7 | 3067 |
| 8 | 11513 |
| 9 | 27403 |
| 10 | 64621 |
| 11 | 185617 |
| 12 | 480853 |
| 13 | 1333951 |
| 14 | 3524431 |
| 15 | 9558361 |
| 16 | 26080333 |
| 17 | 70411483 |
| 18 | 189961939 |