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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 1 |
| 10 | 5065 |
| 11 | 14109865 |
| 12 | 28586753635 |
| 13 | 47057782540912 |
| 14 | 66738127617591430 |
| 15 | 84508389361603849070 |
| 16 | 97838285747685771503930 |
| 17 | 105306724888534860425617883 |
| 18 | 106678207181565103216667658695 |