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 | 20 |
| 2 | 300 |
| 3 | 4000 |
| 4 | 50000 |
| 5 | 600000 |
| 6 | 7000000 |
| 7 | 80000000 |
| 8 | 900000000 |
| 9 | 1000000000 |
| 10 | 1100000000000 |
| 11 | 210000000000000 |
| 12 | 31000000000000000 |
| 13 | 4100000000000000000 |
| 14 | 510000000000000000000 |
| 15 | 61000000000000000000000 |