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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 372709 |
| 6 | 8494464 |
| 7 | 88086873 |
| 8 | 587503616 |
| 9 | 3369273138 |
| 10 | 14491680000 |
| 11 | 56179823994 |
| 12 | 180939738624 |
| 13 | 578688040839 |
| 14 | 1597214147200 |
| 15 | 4080840158787 |