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 | 1 |
| 2 | 10 |
| 3 | 300 |
| 4 | 1000 |
| 5 | 10000 |
| 6 | 300000 |
| 7 | 7000000 |
| 8 | 10000000 |
| 9 | 900000000 |
| 10 | 1000000000 |
| 11 | 110000000000 |
| 12 | 300000000000 |
| 13 | 13000000000000 |
| 14 | 70000000000000 |
| 15 | 300000000000000 |