-1687

Appears in sequences

• G.f.: Product_{k>0} (1-x^(2k-1))/(1-x^(2k)).at n=33A106507
• Cube of the Steinbach matrix as a characteristic polynomial triangular array.at n=59A122185
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 161", based on the 5-celled von Neumann neighborhood.at n=31A270453
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 217", based on the 5-celled von Neumann neighborhood.at n=29A270912
• a(n) = 1 + Sum_{k=2..n} (-1)^k * k^2 * a(floor(n/k)).at n=43A361983
• a(n) = 1 + Sum_{k=2..n} (-1)^k * k^2 * a(floor(n/k)).at n=44A361983