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) |
|---|---|
| 3 | 9 |
| 4 | 256 |
| 5 | 5825 |
| 6 | 117561 |
| 7 | 2229206 |
| 8 | 40645536 |
| 9 | 721957977 |
| 10 | 12587900665 |
| 11 | 216494284886 |
| 12 | 3684700444921 |
| 13 | 62202196684966 |
| 14 | 1043201004995254 |
| 15 | 17402695775329724 |
| 16 | 289035985511398816 |
| 17 | 4782824895703150121 |
| 18 | 78896686234320906753 |
| 19 | 1297987090781736899270 |
| 20 | 21304819716551897181561 |