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 | 3 |
| 1 | 50 |
| 2 | 675 |
| 3 | 8820 |
| 4 | 117600 |
| 5 | 1632960 |
| 6 | 23814000 |
| 7 | 365904000 |
| 8 | 5927644800 |
| 9 | 101189088000 |
| 10 | 1818030614400 |
| 11 | 34326452160000 |
| 12 | 679990671360000 |
| 13 | 14108934647808000 |
| 14 | 306113492805120000 |
| 15 | 6933770723303424000 |