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 | 3 |
| 2 | 12 |
| 3 | 84 |
| 4 | 876 |
| 5 | 12180 |
| 6 | 211692 |
| 7 | 4415124 |
| 8 | 107430636 |
| 9 | 2987482260 |
| 10 | 93461994732 |
| 11 | 3248794543764 |
| 12 | 124223034396396 |
| 13 | 5181679901192340 |
| 14 | 234153759187726572 |
| 15 | 11395053576644512404 |
| 16 | 594148263021558162156 |