The parity-perturbed Hofstadter recursion Q(n) = Q(n-Q(n-1)) + Q(n-Q(n-2)) + (-1)^n with Q(1)=Q(2)=1 is shown to be well-defined for all n ≥ 1 via certified finite-state induction.
On properties of Hofstadter’s Q-sequence.Chaos, Solitons & Fractals, 133:109644, 2020
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Certified Finite-State Induction for a Perturbed Hofstadter Recursion
The parity-perturbed Hofstadter recursion Q(n) = Q(n-Q(n-1)) + Q(n-Q(n-2)) + (-1)^n with Q(1)=Q(2)=1 is shown to be well-defined for all n ≥ 1 via certified finite-state induction.