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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 2 |
| 5 | 3 |
| 6 | 4 |
| 7 | 10 |
| 8 | 37 |
| 9 | 366 |
| 10 | 13532 |
| 11 | 4952675 |
| 12 | 67019597734 |
| 13 | 331926286207224918 |
| 14 | 22245566178948766568816183137 |
| 15 | 7383888166355511098764350563784314022618210032 |