Disable circular lower accumulation between the number of n and !

In the premise of disabling cycle calculated all the numbers between 144-237 cumulative and
God to the point of pursuing big ideas, beginner java novice .
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calculated by summing the number of columns
(237 +144) * (237-144 +1) / 2
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LZ should go to high school math ah
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recursive ~ ~
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which do besides recursion ?   
  . . . Will lead to trouble
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you say , then you can use multiplication and division shift operation . .
this subtraction words. Really can be changed and then shift to solve multiplication . .
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a mathematical formula Well ~
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- which I do not know what , which means that there may be more related with the operator simple arithmetic ah ?
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which in addition to recursive it ?

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only know recursion , think of other ways