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) |
|---|---|
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 27 |
| 6 | 192 |
| 7 | 2280 |
| 8 | 47097 |
| 9 | 1735803 |
| 10 | 115867758 |
| 11 | 14137353466 |
| 12 | 3172486137982 |
| 13 | 1315460211433262 |
| 14 | 1011773137731861712 |
| 15 | 1448486351628212391462 |
| 16 | 3872217739919424676743213 |