228657domain: NAppears in sequencesNumber of defective 4-colorings of an n X 5 0..3 array connected horizontally, vertically, diagonally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..3 order.at n=7A229752G.f.: A(x) satisfies 1 = Sum_{n>=0} Product_{k=n..2*n-1} ( (1+x)^k - A(x) ).at n=6A338178