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) |
|---|---|
| 3 | 1 |
| 4 | 176 |
| 5 | 5490 |
| 6 | 65600 |
| 7 | 455875 |
| 8 | 2239776 |
| 9 | 8647716 |
| 10 | 27962880 |
| 11 | 78920325 |
| 12 | 200002000 |
| 13 | 464447126 |
| 14 | 1003294656 |
| 15 | 2039332295 |
| 16 | 3935444800 |
| 17 | 7261533000 |
| 18 | 12884914176 |
| 19 | 22089914121 |
| 20 | 36733221360 |
| 21 | 59442494650 |
| 22 | 93866696000 |
| 23 | 144987663051 |
| 24 | 219503536736 |
| 25 | 326295822700 |
| 26 | 476993088000 |