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 | 3 |
| 2 | 18 |
| 3 | 156 |
| 4 | 1714 |
| 5 | 22368 |
| 6 | 333910 |
| 7 | 5566728 |
| 8 | 101955050 |
| 9 | 2027241660 |
| 10 | 43372029642 |
| 11 | 991507256804 |
| 12 | 24084513595722 |
| 13 | 618791039789272 |
| 14 | 16751222781082878 |
| 15 | 476239112549941408 |
| 16 | 14179227111187986642 |
| 17 | 441017358981919297508 |