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) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 6 |
| 3 | 71 |
| 4 | 1380 |
| 5 | 34854 |
| 6 | 1092317 |
| 7 | 40900215 |
| 8 | 1781924888 |
| 9 | 88569337730 |
| 10 | 4946558473226 |
| 11 | 306691008191732 |
| 12 | 20903038895529727 |
| 13 | 1553426761730508586 |
| 14 | 125016067017985968931 |
| 15 | 10831572432055401760624 |
| 16 | 1005245087722396707881648 |