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 | 10 |
| 5 | 75 |
| 6 | 520 |
| 7 | 3556 |
| 8 | 24626 |
| 9 | 174805 |
| 10 | 1279240 |
| 11 | 9677151 |
| 12 | 75750752 |
| 13 | 613656836 |
| 14 | 5142797660 |
| 15 | 44557627661 |
| 16 | 398786697398 |
| 17 | 3683575764083 |
| 18 | 35084121263136 |
| 19 | 344242894197456 |
| 20 | 3476490965903174 |
| 21 | 36104281709286841 |
| 22 | 385257741260565844 |
| 23 | 4220537246457019687 |
| 24 | 47432055430482106880 |