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 | 2550 |
| 2 | 1626900 |
| 3 | 462400850 |
| 4 | 74214929700 |
| 5 | 7664751475110 |
| 6 | 553532399900300 |
| 7 | 29615721096973650 |
| 8 | 1225039098412340850 |
| 9 | 40483994261907371450 |
| 10 | 1097141899359944015580 |
| 11 | 24907942311608525171550 |
| 12 | 482175421833854221370900 |