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 | 1 |
| 2 | 2 |
| 3 | 12 |
| 4 | 120 |
| 5 | 1320 |
| 6 | 23100 |
| 7 | 1032300 |
| 8 | 21312000 |
| 9 | 1120212000 |
| 10 | 31311330000 |
| 11 | 2120101110000 |
| 12 | 130203033300000 |
| 13 | 11303022030300000 |
| 14 | 1101030032302200000 |
| 15 | 103001313131311200000 |