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 | 3 |
| 2 | 10 |
| 3 | 28 |
| 4 | 136 |
| 5 | 945 |
| 6 | 5265 |
| 7 | 29889 |
| 8 | 50625 |
| 9 | 203392 |
| 10 | 3290625 |
| 11 | 6082048 |
| 12 | 32536000 |
| 13 | 326481921 |
| 14 | 3274208001 |
| 15 | 6929459200 |
| 16 | 72523096065 |
| 17 | 37694578689 |
| 18 | 471672487936 |
| 19 | 11557226700801 |
| 20 | 54386217385984 |
| 21 | 50624737509376 |
| 22 | 275892612890625 |
| 23 | 4870020829413376 |
| 24 | 68091093855502336 |
| 25 | 2280241934368768 |