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Omni-MATH / The function f:Z²→Z satisfies - f(x,0)=f(0,y)=0, and - f(x,y)=f(x−1,y)+f(x,y−1)+x+y for all nonnegative integers x and y. Find f(6,12). · Discussion

Discussing The function f:Z²→Z satisfies - f(x,0)=f(0,y)=0, and - f(x,y)=f(x−1,y)+f(x,y−1)+x+y for all nonnegative integers x and y. Find f(6,12). · Omni-MATH

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