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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 29 |
| 6 | 151 |
| 7 | 1069 |
| 8 | 9887 |
| 9 | 115891 |
| 10 | 1666421 |
| 11 | 28700933 |
| 12 | 580669933 |
| 13 | 13578126713 |
| 14 | 362075579539 |
| 15 | 10886955278951 |
| 16 | 365589325548857 |
| 17 | 13598064388599629 |
| 18 | 556220494250764093 |