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 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 21 |
| 5 | 104 |
| 6 | 315 |
| 7 | 105 |
| 8 | 1040 |
| 9 | 5355 |
| 10 | 19344 |
| 11 | 3255 |
| 12 | 125840 |
| 13 | 1826055 |
| 14 | 15107664 |
| 15 | 86590175 |
| 16 | 9765 |
| 17 | 880880 |
| 18 | 23738715 |
| 19 | 317260944 |
| 20 | 2684295425 |
| 21 | 16476602400 |
| 22 | 1240155 |
| 23 | 962801840 |
| 24 | 129637122615 |
| 25 | 6196423497264 |
| 26 | 150285647959475 |
| 27 | 2261529015616800 |
| 28 | 23895819265962735 |