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) |
|---|---|
| 0 | 15 |
| 1 | 46 |
| 2 | 1395 |
| 3 | 4231 |
| 4 | 128325 |
| 5 | 389206 |
| 6 | 11804505 |
| 7 | 35802721 |
| 8 | 1085886135 |
| 9 | 3293461126 |
| 10 | 99889719915 |
| 11 | 302962620871 |
| 12 | 9188768346045 |
| 13 | 27869267659006 |
| 14 | 845266798116225 |
| 15 | 2563669662007681 |
| 16 | 77755356658346655 |
| 17 | 235829739637047646 |