Question 328284
I'll do 2, you do the rest.
{{{n=1}}},{{{S=(1(1+1)(2(1)+1))/6=(1(2)(3))/6=1}}}
{{{n=2}}}.{{{S=(2(2+1)(2(2)+1))/6=(2(3)(5))/6=5}}}
Now follow the same steps to get the next 3.