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 | 11 |
| 2 | 101 |
| 3 | 21001 |
| 4 | 1810001 |
| 5 | 2100001 |
| 6 | 61000001 |
| 7 | 2010000001 |
| 8 | 11100000001 |
| 9 | 61000000001 |
| 10 | 1810000000001 |
| 11 | 14100000000001 |
| 12 | 151000000000001 |
| 13 | 5010000000000001 |
| 14 | 9100000000000001 |
| 15 | 271000000000000001 |
| 16 | 1110000000000000001 |
| 17 | 24100000000000000001 |
| 18 | 261000000000000000001 |
| 19 | 3910000000000000000001 |
| 20 | 11100000000000000000001 |