40954

Appears in sequences

• G.f.: (1+3*x+2*x^2)/((1-x)*(1-2*x^2)).at n=25A063757
• Fixed points of permutation A111390.at n=6A114109
• Number of nonisomorphic disconnected mappings (or mapping patterns) from n points to themselves; number of disconnected endofunctions.at n=11A127912
• Number of triangular regions into which a figure made up of a row of n adjacent congruent rectangles is divided upon drawing diagonals of all possible rectangles.at n=25A324042