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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 135 |
| 6 | 329205 |
| 7 | 365924948 |
| 8 | 205640068950 |
| 9 | 75013516525425 |
| 10 | 20611869786684495 |
| 11 | 4661763066154503606 |
| 12 | 917701003163074793520 |
| 13 | 163180081989646991509955 |
| 14 | 26889766005753182579964345 |
| 15 | 4182467653250525215771670424 |
| 16 | 622388054953695081193665509610 |