21950

Appears in sequences

• Number of nonnegative solutions to x^2 + y^2 + z^2 <= n^2.at n=34A000604
• Number of primes <= 12^n.at n=5A058248
• Partial sums of A081660.at n=14A081661
• Integer part of the area of integer triangle [A001611(n), A001611(n+1), A001611(n+2)].at n=15A097281
• 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, 0), (0, -1, 1), (0, 1, -1), (1, -1, 0), (1, 0, 1)}.at n=9A148952
• Number of all polyhedra (tetrahedra of any orientation and octahedra) of any size, formed when intersecting a regular tetrahedron by planes parallel to its sides and dividing its edges into n equal parts.at n=21A216175
• Number of length n+3 0..4 arrays with no four consecutive terms having the maximum of any two terms equal to the minimum of the remaining two terms.at n=3A250383
• T(n,k)=Number of length n+3 0..k arrays with no four consecutive terms having the maximum of any two terms equal to the minimum of the remaining two terms.at n=24A250387
• Number of length 4+3 0..n arrays with no four consecutive terms having the maximum of any two terms equal to the minimum of the remaining two terms.at n=3A250390
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 249", based on the 5-celled von Neumann neighborhood.at n=15A280336
• a(n) is the number of vertices formed by n-secting the angles of a decagon.at n=32A335801
• The smallest of 3 consecutive integers such that the first is divisible by the square of a prime, the second is divisible by the cube of a prime, and the third is divisible by the fourth power of a prime.at n=13A349952
• a(0) = 1; a(n) = Sum_{k=0..floor(n/3)} binomial(n-2*k,k) * a(k).at n=24A352039