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 | 32 |
| 3 | 8051 |
| 4 | 290675 |
| 5 | 4353175 |
| 6 | 38761975 |
| 7 | 243824182 |
| 8 | 1194358326 |
| 9 | 4842169350 |
| 10 | 16924669350 |
| 11 | 52488756425 |
| 12 | 147511725257 |
| 13 | 381689190701 |
| 14 | 920589376525 |
| 15 | 2089893985900 |
| 16 | 4500779925100 |
| 17 | 9254143113132 |
| 18 | 18262909865676 |
| 19 | 34746798604575 |
| 20 | 63973358604575 |
| 21 | 114343801467875 |