217186

Appears in sequences

• Triangle read by rows: T(n,k) is the number of ordered trees having n edges and k branches of length 2.at n=49A101307
• Square of the (3,1)-entry of the 3 X 3 matrix M^n, where M = [1,0,0; 1,1,0; 1,i,1].at n=30A125641
• Triangle of polynomial coefficients related to the o.g.f.s of the RES1 polynomials.at n=18A160468