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 | 1 |
| 1 | 5 |
| 2 | 9 |
| 3 | 13 |
| 4 | 57 |
| 5 | 911 |
| 6 | 1355 |
| 7 | 5799 |
| 8 | 9111313 |
| 9 | 13555757 |
| 10 | 5799911911 |
| 11 | 911131313551355 |
| 12 | 1355575757995799 |
| 13 | 579991191191113139111313 |
| 14 | 9111313135513551355575713555757 |
| 15 | 135557575799579957999119115799911911 |