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) |
|---|---|
| 2 | 6690 |
| 3 | 324570 |
| 4 | 10489660 |
| 5 | 276182500 |
| 6 | 6486444750 |
| 7 | 141606011050 |
| 8 | 2938679135800 |
| 9 | 58759814756160 |
| 10 | 1142125726154350 |
| 11 | 21713533582158110 |
| 12 | 405578743418707380 |
| 13 | 7468021173224848600 |
| 14 | 135906384557097211050 |
| 15 | 2449354951706961634050 |
| 16 | 43785800216111451354800 |
| 17 | 777390470051273329332440 |
| 18 | 13722022446524862502553730 |