261972

Appears in sequences

• a(n) = 2^n - 1 - n*(n+1)/2.at n=18A002662
• 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 33", based on the 5-celled von Neumann neighborhood.at n=17A276966
• Number of (non-null) connected induced subgraphs of the complete tripartite graph K_{n,n,n}.at n=5A290756