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 | 5 |
| 5 | 21 |
| 6 | 110 |
| 7 | 853 |
| 8 | 11111 |
| 9 | 261077 |
| 10 | 11716550 |
| 11 | 1006700565 |
| 12 | 164059830354 |
| 13 | 50335907869219 |
| 14 | 29003487462847208 |
| 15 | 31397381142761241918 |
| 16 | 63969560113225176165145 |
| 17 | 245871831682084026519528568 |