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 A125368 #9 Apr 30 2025 15:17:53
%S A125368 1,31,259,1711,13259,104181,838567,6839941,56392139,468718939,
%T A125368 3921391169,32982034061,278635097351,2362736395895,20099255075641,
%U A125368 171451320170481,1466033625495387,12562096168712455,107842286116562887
%N A125368 Number of base 31 circular n-digit numbers with adjacent digits differing by 4 or less.
%C A125368 [Empirical] a(base,n)=a(base-1,n)+A025014(n+1) for base>=4.int(n/2)+1
%H A125368 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 A125368 (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 A125368 nonn,base
%O A125368 0,2
%A A125368 _R. H. Hardin_, Dec 28 2006