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 | 5 |
| 2 | 1 |
| 3 | 3 |
| 4 | 2 |
| 5 | 4 |
| 6 | 10 |
| 7 | 52 |
| 8 | 81 |
| 9 | 205 |
| 10 | 2089 |
| 11 | 5258 |
| 12 | 27053 |
| 13 | 86885 |
| 14 | 506248 |
| 15 | 1999385 |
| 16 | 15873555 |
| 17 | 35291389 |
| 18 | 341118861 |
| 19 | 1072734242 |