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 | 4 |
| 2 | 22 |
| 3 | 352 |
| 4 | 19426 |
| 5 | 3862744 |
| 6 | 2764634356 |
| 7 | 7403121210496 |
| 8 | 73087416841865890 |
| 9 | 2751096296949421766824 |
| 10 | 387442256655054793494004132 |
| 11 | 210421903024207931092658380560256 |
| 12 | 431805731803048897945138363105712865124 |
| 13 | 3443300668674111298036287560913860498279204224 |