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 A125353 #9 Apr 30 2025 15:13:07
%S A125353 1,16,124,796,5924,44916,348652,2743036,21801764,174565444,1405459324,
%T A125353 11362215276,92138276228,748875775404,6097017988948,49701864868956,
%U A125353 405539673414148,3311264043438796,27050524930821556,221065493126829404
%N A125353 Number of base 16 circular n-digit numbers with adjacent digits differing by 4 or less.
%C A125353 [Empirical] a(base,n)=a(base-1,n)+A025014(n+1) for base>=4.int(n/2)+1
%H A125353 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 A125353 (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 A125353 nonn,base
%O A125353 0,2
%A A125353 _R. H. Hardin_, Dec 28 2006