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) |
|---|---|
| 0 | 1 |
| 1 | 100 |
| 2 | 1 |
| 3 | 10000 |
| 4 | 101 |
| 5 | 1 |
| 6 | 1000000 |
| 7 | 10101 |
| 8 | 102 |
| 9 | 1 |
| 10 | 100000000 |
| 11 | 1010101 |
| 12 | 10203 |
| 13 | 103 |
| 14 | 1 |
| 15 | 10000000000 |
| 16 | 101010101 |
| 17 | 1020304 |
| 18 | 10306 |
| 19 | 104 |
| 20 | 1 |
| 21 | 1000000000000 |
| 22 | 10101010101 |
| 23 | 102030405 |
| 24 | 1030610 |
| 25 | 10410 |
| 26 | 105 |
| 27 | 1 |
| 28 | 100000000000000 |
| 29 | 1010101010101 |