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 | 4 |
| 4 | 14 |
| 5 | 52 |
| 6 | 256 |
| 7 | 1396 |
| 8 | 9064 |
| 9 | 62420 |
| 10 | 500000 |
| 11 | 4250180 |
| 12 | 40738880 |
| 13 | 410140060 |
| 14 | 4572668112 |
| 15 | 53214384548 |
| 16 | 676739353112 |