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 | 1 |
| 3 | 17 |
| 4 | 453 |
| 5 | 17465 |
| 6 | 921233 |
| 7 | 63789145 |
| 8 | 5616599013 |
| 9 | 613148157073 |
| 10 | 81298838448001 |
| 11 | 12871080897739073 |
| 12 | 2398329378160629861 |
| 13 | 519554377953510437129 |
| 14 | 129472180384695112970705 |
| 15 | 36773246580917492621295817 |
| 16 | 11807854666147122586977709125 |
| 17 | 4255708041349122783137436409249 |
| 18 | 1710617624877842754809697811363969 |