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 | 2 |
| 2 | 231 |
| 3 | 1010 |
| 4 | 102010 |
| 5 | 451429 |
| 6 | 1000100 |
| 7 | 9426681 |
| 8 | 1000001000 |
| 9 | 8803095102 |
| 10 | 10002000100 |
| 11 | 56017891104 |
| 12 | 1000000010000 |
| 13 | 4811618419542 |