Here is my suggestion on how to approach this problem:
% Here is your user input
userInput = 3;
% create an array containing zeros (or uses ones if it should contain 1s)
% that has one column
yourArray = zeros(userInput,1);
% Convert your array to a table
T = array2table(yourArray);
% Rename the column, if desired
T.Properties.VariableNames = {'NameOfColumn'};