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 | 47 |
| 3 | 491 |
| 4 | 4919 |
| 5 | 49877 |
| 6 | 499943 |
| 7 | 4999913 |
| 8 | 49999757 |
| 9 | 499999931 |
| 10 | 4999999937 |
| 11 | 49999999811 |
| 12 | 499999999769 |
| 13 | 4999999998431 |
| 14 | 49999999999619 |
| 15 | 499999999999769 |
| 16 | 4999999999998557 |
| 17 | 49999999999998887 |
| 18 | 499999999999999679 |