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 | 1 |
| 1 | 5 |
| 2 | 14 |
| 3 | 30 |
| 4 | 1785 |
| 5 | 6930 |
| 6 | 149226 |
| 7 | 3573570 |
| 8 | 139223370 |
| 9 | 3708968340 |
| 10 | 62366724420 |
| 11 | 2279301054030 |
| 12 | 1348519628145690 |
| 13 | 27928822496705130 |
| 14 | 1558931949520935990 |
| 15 | 430616881400429491950 |
| 16 | 161887663616926971163440 |