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 | 0 |
| 5 | 0 |
| 6 | 82 |
| 7 | 4348 |
| 8 | 160050 |
| 9 | 4696504 |
| 10 | 118353618 |
| 11 | 2675297588 |
| 12 | 55758114082 |
| 13 | 1091344752470 |
| 14 | 20318440463052 |
| 15 | 363171011546210 |
| 16 | 6275111078422480 |
| 17 | 105369657960443204 |
| 18 | 1726590417107274316 |
| 19 | 27699670730854989616 |
| 20 | 436246336648672487876 |