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 | 4 |
| 7 | 37 |
| 8 | 381 |
| 9 | 2717 |
| 10 | 18760 |
| 11 | 116439 |
| 12 | 565943 |
| 13 | 3033697 |
| 14 | 14835067 |
| 15 | 72633658 |
| 16 | 356923880 |
| 17 | 1746833634 |
| 18 | 8532601529 |
| 19 | 41868336466 |
| 20 | 205618704167 |
| 21 | 1012359995953 |