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 | 0 |
| 1 | 0 |
| 2 | 10 |
| 3 | 190 |
| 4 | 1990 |
| 5 | 20710 |
| 6 | 207910 |
| 7 | 2087110 |
| 8 | 20879110 |
| 9 | 208870390 |
| 10 | 2088783190 |
| 11 | 20888623990 |
| 12 | 208887031990 |
| 13 | 2088878232790 |
| 14 | 20888790240790 |
| 15 | 208887981528790 |
| 16 | 2088879894408790 |
| 17 | 20888799735217510 |
| 18 | 208887998143304710 |
| 19 | 2088879989344263910 |
| 20 | 20888799901353855910 |