format long; nmax = 100; a = zeros(1,nmax); b = zeros(1,nmax); n = 77, a(1) = 1; a(2) = 2; % n = 78, a(1) = 1; a(2) = 2; % n = 75, a(1) = 1; a(2) = 1.5; % n = 76, a(1) = 1; a(2) = 1.5; % n = 30, a(1) = 1; a(2) = 1.1; % n = 40, a(1) = 1; a(2) = 1.1; % n = 50, a(1) = 1; a(2) = 1.1; for i = 3:n a(i) = a(i-1)+a(i-2); end b(n) = a(n); b(n-1) = a(n-1); for i = n-2:-1:1 b(i) = b(i+2)-b(i+1); end a1 = a(1) a2 = a(2) a2_minus_a1 = a(2)-a(1) b2_minus_b1 = b(2)-b(1)