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 | 102 |
| 4 | 1000 |
| 5 | 10000 |
| 6 | 100002 |
| 7 | 1000006 |
| 8 | 10000000 |
| 9 | 100000008 |
| 10 | 1000000000 |
| 11 | 10000000010 |
| 12 | 100000000008 |
| 13 | 1000000000012 |
| 14 | 10000000000004 |
| 15 | 100000000000005 |
| 16 | 1000000000000000 |
| 17 | 10000000000000016 |
| 18 | 100000000000000008 |
| 19 | 1000000000000000018 |
| 20 | 10000000000000000000 |