86710

Appears in sequences

• From random walks on complete directed triangle.at n=22A007829
• Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 2 ones in any 2 X 2 X 2 subtriangle.at n=10A153908
• Number of 2X3 integer matrices with each row summing to zero, row elements in nondecreasing order, rows in lexicographically nondecreasing order, and the sum of squares of the elements <= 2*n^2 (number of collections of 2 zero-sum 3-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).at n=30A192698
• Number of ways to select 4 numbers from the set of the first n natural numbers avoiding 3-term arithmetic progressions.at n=37A300760
• Numbers whose prime exponents generates rotationally symmetric XOR-triangles.at n=37A335019
• Expansion of g*(1 + x*g^2), where g = 1+x*g^4 is the g.f. of A002293.at n=7A391381