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 | 4907776 |
| 5 | 250334405 |
| 6 | 4432154880 |
| 7 | 83634563315 |
| 8 | 797134274560 |
| 9 | 5623659900846 |
| 10 | 41662871239680 |
| 11 | 222405745759290 |
| 12 | 917018531400960 |
| 13 | 4294168964874715 |
| 14 | 16067910057871616 |
| 15 | 50983015079601525 |