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RosettaCodeData/Task/Hofstadter-Q-sequence/Mathematica/hofstadter-q-sequence-1.math

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Hofstadter[1] = Hofstadter[2] = 1;
Hofstadter[n_Integer?Positive] := Hofstadter[n] = Block[{$RecursionLimit = Infinity},
Hofstadter[n - Hofstadter[n - 1]] + Hofstadter[n - Hofstadter[n - 2]]
]
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