18933

Appears in sequences

• Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 24.at n=52A051965
• Number of intersections inside an equilateral triangular figure formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts. If three or more lines meet at an interior point this intersection is counted only once.at n=10A092866
• 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, 0, 1), (0, -1, 1), (1, 1, -1), (1, 1, 0)}.at n=9A148943
• Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, -1), (-1, 0), (-1, 1), (0, -1), (1, 0)}.at n=11A151504
• Number of (n+1)X(2+1) 0..2 arrays with each row nonprime and column prime, read as a base 3 number with top and left being the most significant digits.at n=3A262107
• T(n,k) = Number of (n+1) X (k+1) 0..2 arrays with each row nonprime and column prime, read as a base 3 number with top and left being the most significant digits.at n=13A262109
• Number of (4+1)X(n+1) 0..2 arrays with each row nonprime and column prime, read as a base 3 number with top and left being the most significant digits.at n=1A262113
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 371", based on the 5-celled von Neumann neighborhood.at n=29A271456
• Expansion of exp( Sum_{n>=1} sigma_3(2*n)*x^n/n ) in powers of x.at n=5A282327