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 | 19 |
| 2 | 103 |
| 3 | 463 |
| 4 | 1951 |
| 5 | 130303 |
| 6 | 8589737983 |
| 7 | 36028796616310783 |
| 8 | 144115187270549503 |
| 9 | 147573952563906609151 |
| 10 | 9444732965533131997183 |
| 11 | 158456325028527830762157768703 |
| 12 | 10889035741470030830606626508932068147199 |
| 13 | 3064991081731777716716694050586798249381337419669831679 |