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see the general equation in Table 33 

X(4), X(20), X(3146) reflections of A, B, C in H vertices of the antimedial triangle their reflections in H 

K425 is the cubic Lk with k = 1. See Table 33. See also Hyacinthos #14861 & sq. It is a central cubic with center H. The inflexional tangent passes through X(51). Its infinite points are those of pK(X6, X3146), a member of the Euler pencil. X(3146) is the reflection of X(20) in H. The complement of K425 is K426, a central cubic with center O. 
