[seqfan] Re: Exchange rightmost two base-4 digits of n>1; a(0)=0, a(1)=4. (base 4 analogue of what A181099 is in base 3, and A080412 is base 2

[allouche at math.jussieu.fr]

Dear Georgi

Not a real problem: you discovered the periodicity!
best
jp

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