105522176domain: NAppears in sequencesSchroeder paths with two rise colors and two level colors.at n=9A156017Triangle T(n,k) for A(x)^k=sum(n>=k T(n,k)*x^n), where o.g.f. A(x) satisfies A(x)=(a+b*x*A(x))/(c-d*x*A(x)), a=1,b=2,c=1,d=2.at n=45A183875