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 | 7 |
| 4 | 56 |
| 5 | 348 |
| 6 | 4672 |
| 7 | 93864 |
| 8 | 1776576 |
| 9 | 42654496 |
| 10 | 1464068352 |
| 11 | 62669138688 |
| 12 | 2416965949440 |
| 13 | 119518360215552 |