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 | 50 |
| 2 | 210 |
| 3 | 450 |
| 4 | 780 |
| 5 | 1500 |
| 6 | 3920 |
| 7 | 16500 |
| 8 | 91728 |
| 9 | 269500 |
| 10 | 493920 |
| 11 | 1293600 |
| 12 | 266378112 |
| 13 | 317447424 |
| 14 | 1277337600 |
| 15 | 14948388000 |
| 16 | 48697248600 |
| 17 | 379748636467200 |