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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 1601292 |
| 8 | 314949564 |
| 9 | 17143061738 |
| 10 | 423677826986 |
| 11 | 6210264633994 |
| 12 | 62831788827614 |
| 13 | 481992723228798 |
| 14 | 2982908737810114 |
| 15 | 15548436178142582 |
| 16 | 70420082692285198 |
| 17 | 283631426534134042 |
| 18 | 1034163399690010346 |
| 19 | 3461457325296584554 |
| 20 | 10754832937513676198 |