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 | 6 |
| 4 | 16 |
| 5 | 54 |
| 6 | 232 |
| 7 | 936 |
| 8 | 3880 |
| 9 | 17302 |
| 10 | 81584 |
| 11 | 409012 |
| 12 | 2138674 |
| 13 | 11754832 |
| 14 | 66857094 |
| 15 | 399774882 |
| 16 | 2469567300 |
| 17 | 15804526682 |