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 | 6 |
| 2 | 24 |
| 3 | 112 |
| 4 | 974 |
| 5 | 9928 |
| 6 | 197152 |
| 7 | 4547688 |
| 8 | 200947508 |
| 9 | 10553936856 |
| 10 | 1051895421812 |
| 11 | 125339066655024 |
| 12 | 28078885802576900 |
| 13 | 7575400864257725704 |