175790

Appears in sequences

• Sum of even products minus sum of odd products of different pairs of numbers from 1 to n.at n=39A134449
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 155", based on the 5-celled von Neumann neighborhood.at n=17A279253
• 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=38A344791