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 | 5 |
| 1 | 550 |
| 2 | 61250 |
| 3 | 8330000 |
| 4 | 1440600000 |
| 5 | 318084480000 |
| 6 | 88994505600000 |
| 7 | 31196975040000000 |
| 8 | 13537335651840000000 |
| 9 | 7186069008518400000000 |
| 10 | 4614893517270516480000000 |
| 11 | 3548831033950800998400000000 |
| 12 | 3237226357799023349760000000000 |
| 13 | 3472842105575052965314560000000000 |