This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A125329 #9 Apr 30 2025 15:04:46
%S A125329 1,19,121,619,3697,22389,138973,874277,5559985,35648953,230069191,
%T A125329 1492690207,9727027549,63617931357,417371683689,2745447557409,
%U A125329 18100412004049,119567904627743,791186114040565,5243056748156375
%N A125329 Number of base 19 circular n-digit numbers with adjacent digits differing by 3 or less.
%C A125329 [Empirical] a(base,n)=a(base-1,n)+A025012(n+1) for base>=3.int(n/2)+1
%H A125329 OEIS Wiki, <a href="/wiki/Number_of_base_k_circular_n-digit_numbers_with_adjacent_digits_differing_by_d_or_less">Number of base k circular n-digit numbers with adjacent digits differing by d or less</a>
%o A125329 (S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>3)+($[(i+1)mod N]`-$[i]`>3))
%K A125329 nonn,base
%O A125329 0,2
%A A125329 _R. H. Hardin_, Dec 28 2006