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) |
|---|---|
| 2 | 1 |
| 3 | 8 |
| 4 | 107 |
| 5 | 654 |
| 6 | 2801 |
| 7 | 9859 |
| 8 | 30869 |
| 9 | 89951 |
| 10 | 250780 |
| 11 | 680665 |
| 12 | 1818310 |
| 13 | 4813018 |
| 14 | 12674542 |
| 15 | 33283434 |
| 16 | 87272241 |
| 17 | 228658744 |
| 18 | 598864479 |
| 19 | 1568137061 |
| 20 | 4105798635 |
| 21 | 10749568905 |
| 22 | 28143285770 |
| 23 | 73680744203 |
| 24 | 192899492252 |
| 25 | 505018380164 |
| 26 | 1322156411756 |
| 27 | 3461451749404 |