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 | 4 |
| 3 | 22 |
| 4 | 111 |
| 5 | 121 |
| 6 | 202 |
| 7 | 1001 |
| 8 | 1111 |
| 9 | 10001 |
| 10 | 10201 |
| 11 | 11111 |
| 12 | 100001 |
| 13 | 1000001 |
| 14 | 1001001 |
| 15 | 1012101 |
| 16 | 1100011 |
| 17 | 1101011 |
| 18 | 1111111 |
| 19 | 10000001 |
| 20 | 100000001 |
| 21 | 101000101 |
| 22 | 110000011 |
| 23 | 200010002 |
| 24 | 10000000001 |
| 25 | 10011111001 |
| 26 | 11000100011 |
| 27 | 11001010011 |
| 28 | 11100100111 |
| 29 | 11101010111 |
| 30 | 20000100002 |