43799

Appears in sequences

• Sum of even products minus sum of odd products of different pairs of numbers from 1 to n.at n=27A134449
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 133", based on the 5-celled von Neumann neighborhood.at n=40A270234
• a(n) is the number of 2-point antichains in the poset D_{2n+1} of type D, whose elements are compositions of 2n+1.at n=26A344791