Posts by ok12d
Python 3, 149 bytes g=lambda r:r>1and g(r-1)+g(r-2)or r lambda n:[i for(i)in map(g,range(2*n+2))if(lambda*l:all(abs(n-i)!=1for(n,i)in zip(l,l[1:])))(*map(int,str(i)))][n] Try it online! ...
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Charcoal, 88 bytes ≔⪪η λＦＬθ«¿¬⁼θ⁰«≔…θ⁺ι¹π¿№λπ«≔πω§≔λ⌕λω⁰»«¿Σ⭆λ⁼…κ⁺ι¹π«≔§Φλ⁼…κ⁺ι¹π⁰ω§≔λ⌕λω⁰»«θ≔⁰θ»»»»¿¬⁼θ⁰«ω Try it online!
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