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 | 1 |
| 5 | 32 |
| 6 | 550 |
| 7 | 6364 |
| 8 | 68291 |
| 9 | 683896 |
| 10 | 6641319 |
| 11 | 63276295 |
| 12 | 596278790 |
| 13 | 5582122930 |
| 14 | 52074517134 |
| 15 | 484995150904 |
| 16 | 4514960515811 |
| 17 | 42043818101407 |
| 18 | 391829984349446 |