Question 824176
sequence 2,4,6,8....2n   (n numbers of rows)
         
adding
         (2+2n)n/2
let get approximate to 950
        (2+2n)n/2=950
        (2n + 2n^2)/2=950
         n+n*n=950
for n=30
         30+30*30=930
for n=31 rows
we need   31+31*31=992 blocks and we have only 950 so 
30 rows tall is the answer