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 | 1 |
| 7 | 20349 |
| 8 | 21426300 |
| 9 | 8956859646 |
| 10 | 2352103292070 |
| 11 | 470090359867986 |
| 12 | 79002015147719136 |
| 13 | 11836068369346126698 |
| 14 | 1640443794179544776604 |
| 15 | 215598057543037336382670 |
| 16 | 27336005392867324870778880 |
| 17 | 3385297472808136707459580488 |
| 18 | 413211903044379104303226531072 |