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 | 2 |
| 3 | 4 |
| 4 | 12 |
| 5 | 82 |
| 6 | 231 |
| 7 | 380 |
| 8 | 2990 |
| 9 | 20954 |
| 10 | 40953 |
| 11 | 42852 |
| 12 | 182492 |
| 13 | 859647 |
| 14 | 8039644 |
| 15 | 11990003 |
| 16 | 78269808 |
| 17 | 3263358159 |
| 18 | 6941215856 |