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 | 6 |
| 2 | 36 |
| 3 | 126 |
| 4 | 756 |
| 5 | 2016 |
| 6 | 23976 |
| 7 | 46956 |
| 8 | 435456 |
| 9 | 1683576 |
| 10 | 15128856 |
| 11 | 36284472 |
| 12 | 547204896 |
| 13 | 1088416056 |
| 14 | 13060989936 |
| 15 | 58782164616 |
| 16 | 352913845536 |
| 17 | 1057916846196 |
| 18 | 16926689693376 |
| 19 | 33853322280036 |
| 20 | 457078896068256 |
| 21 | 1828085963706576 |