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 A125326 #9 Apr 30 2025 15:03:42
%S A125326 1,16,100,508,3004,18036,110980,692204,4364284,27740164,177454720,
%T A125326 1141017256,7367263276,47731405088,310118484762,2019608005218,
%U A125326 13178042856428,86126612389832,563648913800290,3692893237251226
%N A125326 Number of base 16 circular n-digit numbers with adjacent digits differing by 3 or less.
%C A125326 [Empirical] a(base,n)=a(base-1,n)+A025012(n+1) for base>=3.int(n/2)+1
%H A125326 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 A125326 (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 A125326 nonn,base
%O A125326 0,2
%A A125326 _R. H. Hardin_, Dec 28 2006