Help writing two equations in Matlab (Please view Attachment)

I have two equations and I want to loop a value for 'n' from 1 to 50. I want to put these equations in so that Ln (equation 1) is part of Bn (equation 2). The constants are given below:

    S = 1200; 
    Lx = 0.127;
    Ly = 0.203;
    k = 0.16;

I have tried this and all it gives for Bn is negative values of zero which is not right:

    Ln = zeros(1,nmax); Bn = zeros(1,nmax); 
    for n = 1:nmax 
        Ln(n)= ((2*n-1)*pi)/(2*Lx); 
        Bn(n) = ((2*S)/(k*Lx))*(((-1)^n)./((Ln(n).^3).*cosh(Ln(n)*Ly))); 
    end

[Star Strider]

I get ‘B(n)’ as a rapidly decaying oscillation asymptotic to 0 when I write my own code for your equation. If this is not the result you expect, and you copied your function correctly, check your constants.

[Hendrik]

It is because according to your formula the values for Bn become extremely small. And because the first value is -10.07 which his much much larger, the later entries in the array will appear as 0. For example Bn(50) is 1.4e-112

Also if you use a for loop, there is no need to put a dot in front of the / or the *