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 A125323 #9 Apr 30 2025 15:02:30
%S A125323 1,13,79,397,2311,13683,82987,510131,3168583,19831375,124840519,
%T A125323 789359815,5007964879,31854401891,203018085727,1295846704827,
%U A125323 8280758646855,52962057017063,338958602652535,2170431924516647
%N A125323 Number of base 13 circular n-digit numbers with adjacent digits differing by 3 or less.
%C A125323 [Empirical] a(base,n)=a(base-1,n)+A025012(n+1) for base>=3.int(n/2)+1
%H A125323 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 A125323 (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 A125323 nonn,base
%O A125323 0,2
%A A125323 _R. H. Hardin_, Dec 28 2006