18005

Appears in sequences

• Coordination sequence for MgNi2, Position Mg2.at n=33A009935
• G.f.: (x+4*x^3+x^5)/((1-x)^2*(1-x^2)^2*(1-x^3)).at n=29A083707
• 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, 0, 1), (0, 1, 0), (1, -1, -1), (1, -1, 1)}.at n=10A148249
• Expansion of (1+3*x)/(1-x^2-2*x^3).at n=23A159285
• Positions of zeros in A165597.at n=28A165598
• a(n) = A005259(n) mod (n+1)^3.at n=29A289289
• Expansion of g.f. Sum_{n>=1} q^n/(1-q^(2*n)-q^(3*n)).at n=38A368689
• Integers k such that k = a^2 + b^2 = c^2 + d^2 and a + b = 3(c - d), where a, b, c and d are distinct positive integers.at n=41A369498