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 | 1 |
| 3 | 1 |
| 4 | 13 |
| 5 | 13 |
| 6 | 608 |
| 7 | 4094 |
| 8 | 1875397 |
| 9 | 143639306 |
| 10 | 5613099946 |
| 11 | 20207317759 |
| 12 | 1474035260669 |