19088

Appears in sequences

• a(n) = (1/24)*(sigma_3(2*n-1) - sigma_1(2*n-1)).at n=38A081861
• G.f.: (x^2+x-1)*(1+2*x+S)*(1-5*x+2*x^2+(3*x-1)*S)^2*(-1+3*x+2*x^2+(1-x)*S), where S=sqrt(1-4*x).at n=13A135925
• Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, -1), (-1, 1), (-1, 0), (0, 1), (1, -1), (1, 0), (1, 1)}.at n=6A151329
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 609", based on the 5-celled von Neumann neighborhood.at n=26A273210
• Starts of runs of 3 consecutive tribonacci-Niven numbers (A352089).at n=15A352091
• a(n) = Sum_{k=0..floor(n/4)} 2^(n-4*k) * binomial(2*n-6*k,2*k).at n=11A387691