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 | 0 |
| 2 | 50 |
| 3 | 250 |
| 4 | 3750 |
| 5 | 31250 |
| 6 | 343750 |
| 7 | 3281250 |
| 8 | 33593750 |
| 9 | 332031250 |
| 10 | 3339843750 |
| 11 | 33300781250 |
| 12 | 333496093750 |
| 13 | 3332519531250 |
| 14 | 33337402343750 |
| 15 | 333312988281250 |
| 16 | 3333435058593750 |
| 17 | 33332824707031250 |
| 18 | 333335876464843750 |