18) Find the formula for an if a1 = 23 and az = 177 and an+1 = 15an - 56an-1? ) No more than b) No clubs or face cards? 19) For m,n > 1 we have, A(n,m) = n*A(n-1,m) +and5 (m+1)*A(n-1,A(n-1,m-1)) and for every n>0, A(n,0) = 1 and A(0,n) = 2 and A(0,0)=3. Find A(2,2)