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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 47 |
| 5 | 1372 |
| 6 | 31007 |
| 7 | 611322 |
| 8 | 11017122 |
| 9 | 186044902 |
| 10 | 2992773591 |
| 11 | 46378655568 |
| 12 | 697928466684 |
| 13 | 10257901689164 |
| 14 | 147883893647230 |