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 | 5 |
| 4 | 18 |
| 5 | 164 |
| 6 | 1538 |
| 7 | 20018 |
| 8 | 408404 |
| 9 | 7759748 |
| 10 | 148728578 |
| 11 | 6976017044 |
| 12 | 7317446132 |