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 | 0 |
| 1 | 1 |
| 2 | 100 |
| 3 | 10201 |
| 4 | 1040400 |
| 5 | 106110601 |
| 6 | 10822240900 |
| 7 | 1103762461201 |
| 8 | 112572948801600 |
| 9 | 11481337015302001 |
| 10 | 1170983802612002500 |
| 11 | 119428866529408953001 |
| 12 | 12180573402197101203600 |