a(n) is the number of reflectable bases of the root system of type D_n.
A321233
a(n) is the number of reflectable bases of the root system of type D_n.
Terms
- a(0) =0a(1) =4a(2) =128a(3) =4992a(4) =241664a(5) =14131200a(6) =972521472a(7) =77138231296
External references
- oeis: A321233