393472

Appears in sequences

• a(n) is the sum of all integers from 2^(n-2)+1 to 2^(n-1).at n=9A049775
• Number of periodic palindromic structures of length n using a maximum of two different symbols.at n=37A056503
• Expansion of x*(1+5*x)/((1+2*x+1)*(1-4*x)).at n=10A117110
• a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) for n > 4, with first terms 1, 2, 4, 7.at n=19A135360
• a(n) = ((2^n)*((2^n)+1) - (2^(n-1))*((2^(n-1))+1))/2, a(1)=3.at n=9A158561
• 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 777", based on the 5-celled von Neumann neighborhood.at n=21A283916
• Dirichlet g.f.: Product_{k>=2} 1 / (1 - k^(-s))^(k^9).at n=3A343289