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) |
|---|---|
| 0 | 2 |
| 1 | 20 |
| 2 | 306 |
| 3 | 7376 |
| 4 | 273956 |
| 5 | 15345156 |
| 6 | 1274990124 |
| 7 | 155024945978 |
| 8 | 27422185371264 |
| 9 | 6981850496603886 |
| 10 | 2547185424690611836 |