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 | 0 |
| 2 | 10 |
| 3 | 102 |
| 4 | 1000 |
| 5 | 10000 |
| 6 | 102000 |
| 7 | 1000300 |
| 8 | 10000000 |
| 9 | 102000600 |
| 10 | 1000000000 |
| 11 | 10000108360 |
| 12 | 102000060480 |
| 13 | 1000006930000 |
| 14 | 10000063165960 |
| 15 | 102000042276960 |
| 16 | 1000000000000000 |
| 17 | 10000000141981840 |
| 18 | 102000006021375360 |
| 19 | 1000000081060819840 |
| 20 | 10000000000000000000 |