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 A125350 #9 Apr 30 2025 15:12:14
%S A125350 1,13,97,613,4457,33063,250669,1923655,14884769,115789951,903866897,
%T A125350 7071440807,55403165585,434470766327,3409117220977,26760021485703,
%U A125350 210104387835521,1649871912782039,12957097087570897,101763543017243975
%N A125350 Number of base 13 circular n-digit numbers with adjacent digits differing by 4 or less.
%C A125350 [Empirical] a(base,n)=a(base-1,n)+A025014(n+1) for base>=4.int(n/2)+1
%H A125350 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 A125350 (S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>4)+($[(i+1)mod N]`-$[i]`>4))
%K A125350 nonn,base
%O A125350 0,2
%A A125350 _R. H. Hardin_, Dec 28 2006