104286

Appears in sequences

• Number of real regular n X n (0,1) matrices modulo rows permutations.at n=5A088389
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, -1, 0), (-1, 1, 0), (1, -1, 1), (1, 0, 0)}.at n=12A148180
• a(n) = [x^n] Product_{k>=1} (1 + n*x^k).at n=13A291698
• a(n) is the number of isosceles trapezoids in a triangular grid of side length n.at n=26A389363