Computing...

Input:

A(2, A(2, 1))


Result:

13


Expansion:

A(2, 5) |  =  | A(1, A(2, 4))\n |  =  | A(1, A(1, A(2, 3)))\n |  =  | A(1, A(1, A(1, A(2, 2))))\n |  =  | A(1, A(1, A(1, A(1, A(2, 1)))))\n |  =  | A(1, A(1, A(1, A(1, A(1, A(2, 0))))))\n |  =  | A(1, A(1, A(1, A(1, A(1, A(1, 1))))))\n |  =  | A(1, A(1, A(1, A(1, A(1, A(0, A(1, 0)))))))\n |  =  | A(1, A(1, A(1, A(1, A(1, A(0, A(0, 1)))))))\n |  =  | A(1, A(1, A(1, A(1, A(1, A(0, 2))))))\n |   (vertical ellipsis) |


Function properties:

total  |  not primitive recursive

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