Identify the missing term in this number pattern.

6, 11, 20, 37, 70, 135, ?

The correct answer is 264.

To identify the missing term in the sequence, we examine the relationship between consecutive numbers to discover the underlying mathematical pattern.

Let us analyze each transition step-by-step:

First to Second term:
Multiply the first number by 2 and subtract 1:
$6\times 2-1=12-1=11$

Second to Third term:
Multiply the second number by 2 and subtract 2:
$11\times 2-2=22-2=20$

Third to Fourth term:
Multiply the third number by 2 and subtract 3:
$20\times 2-3=40-3=37$

Fourth to Fifth term:
Multiply the fourth number by 2 and subtract 4:
$37\times 2-4=74-4=70$

Fifth to Sixth term:
Multiply the fifth number by 2 and subtract 5:
$70\times 2-5=140-5=135$

Sixth to Seventh term (Missing term):
Following the pattern, we multiply each term by 2 and subtract an increasing integer (1, 2, 3, 4, 5, 6...). Therefore, to find the 7th term, we multiply the 6th term by 2 and subtract 6:
$135\times 2-6=270-6=264$

Thus, the missing term in the sequence is 264.