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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 12 |
| 5 | 72 |
| 6 | 516 |
| 7 | 2727 |
| 8 | 29935 |
| 9 | 295297 |
| 10 | 2830610 |
| 11 | 27816612 |
| 12 | 288374240 |
| 13 | 4410043504 |
| 14 | 44410041788 |
| 15 | 716533737436 |
| 16 | 16424244452552 |