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A magic hexagon of order n is an arrangement of close-packed hexagons containing the numbers 1, 2, ..., H_(n-1), where H_n is the nth hex number such that the numbers along ...
A quartic graph is a graph which is 4-regular. The unique quartic graph on five nodes is the complete graph K_5, and the unique quartic graph on six nodes is the octahedral ...
The Thue-Morse constant, also called the parity constant, is given by the concatenated digits of the Thue-Morse sequence P=0.0110100110010110100101100..._2 (1) (OEIS A010060) ...
The determination of the number of alternating permutations having elements {1,2,...,n}.
A circle-preserving transformation composed of an odd number of inversions.
A base-60, or sexagesimal, number system, used by the ancient Babylonians.
A variable which belongs to exactly one of a finite number of categories.
The number of elements of a group in a given conjugacy class.
When ac is divisible by a number b that is relatively prime to a, then c must be divisible by b.
The number of alternating permutations for n elements is sometimes called an Euler zigzag number. Denote the number of alternating permutations on n elements for which the ...
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