Step 1: Look at the square number on the right first: the base of the square number is 5, 10, 17, 26 respectively, and the difference between two adjacent numbers is 5, 7, 9 respectively, which is an odd column. Available: The next difference is 1 1, ∴26+ 1 1=37.

Step 2: Look at it again = the second square number on the left. The bases of square numbers are 4, 6, 8 and 10 respectively, which is an arithmetic even number sequence. We can conclude that the next term is 10+2= 12.

The first square of the fifth item is: 37 square -65438 square +02 = 35 square.

The formula [(n+ 1) square-1 square +(2n+2) square =[(n+ 1) square+1] square.