Wolfram|Alpha

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Input:

A(4, 1)


Result:

65533


Expansion:

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


Function properties:

total  |  not primitive recursive

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