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 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 6 |
| 4 | 8 |
| 5 | 35 |
| 6 | 292 |
| 7 | 673 |
| 8 | 2818 |
| 9 | 16956 |
| 10 | 219772 |
| 11 | 636748 |
| 12 | 3768505 |
| 13 | 20309534 |
| 14 | 183403268 |
| 15 | 3227600747 |
| 16 | 12272598308 |
| 17 | 81353466578 |
| 18 | 561187259734 |
| 19 | 4416808925866 |
| 20 | 50303004612136 |
| 21 | 1238783066956740 |
| 22 | 5566249468690291 |
| 23 | 44970939483601100 |
| 24 | 330144217684933896 |
| 25 | 3131452652308459402 |