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 | 10 |
| 5 | 29 |
| 6 | 119 |
| 7 | 667 |
| 8 | 6024 |
| 9 | 88500 |
| 10 | 2109828 |
| 11 | 78347534 |
| 12 | 4383817811 |
| 13 | 362181166439 |