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 | 0 |
| 3 | 10795 |
| 4 | 680085 |
| 5 | 33732216 |
| 6 | 1405509000 |
| 7 | 50008107375 |
| 8 | 1550251328625 |
| 9 | 42545493649000 |
| 10 | 1046619143765400 |
| 11 | 23311068641056875 |
| 12 | 473991729034823125 |
| 13 | 8859999141328482000 |
| 14 | 153151413728678046000 |