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) |
|---|---|
| 6 | 1 |
| 7 | 42 |
| 8 | 1128 |
| 9 | 24804 |
| 10 | 487635 |
| 11 | 8936928 |
| 12 | 156238908 |
| 13 | 2641902120 |
| 14 | 43595145594 |
| 15 | 706252528630 |
| 16 | 11279926456656 |
| 17 | 178152655364880 |
| 18 | 2788629694000605 |
| 19 | 43334780015908584 |
| 20 | 669413654240461560 |
| 21 | 10289781864706066800 |