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 | 79 |
| 3 | 1279 |
| 4 | 5119 |
| 5 | 20479 |
| 6 | 81919 |
| 7 | 1310719 |
| 8 | 21474836479 |
| 9 | 1407374883553279 |
| 10 | 90071992547409919 |
| 11 | 23611832414348226068479 |
| 12 | 1784059615882449851322857461811868920478433279 |