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 | 8 |
| 2 | 120 |
| 3 | 2024 |
| 4 | 35960 |
| 5 | 658008 |
| 6 | 12271512 |
| 7 | 231917400 |
| 8 | 4426165368 |
| 9 | 85113005120 |
| 10 | 1646492110120 |
| 11 | 32006008361808 |
| 12 | 624668654531480 |
| 13 | 12233149001721760 |
| 14 | 240260199935164200 |
| 15 | 4730523156632595024 |
| 16 | 93343021201262177400 |
| 17 | 1845382436487682488000 |