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 A125325 #9 Apr 30 2025 15:03:24
%S A125325 1,15,93,471,2773,16585,101649,631513,3965717,25103901,159916563,
%T A125325 1023792939,6580680769,42436151201,274373773501,1777776831901,
%U A125325 11538964492821,75001583213817,488059829837697,3178929941530215
%N A125325 Number of base 15 circular n-digit numbers with adjacent digits differing by 3 or less.
%C A125325 [Empirical] a(base,n)=a(base-1,n)+A025012(n+1) for base>=3.int(n/2)+1
%H A125325 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 A125325 (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 A125325 nonn,base
%O A125325 0,2
%A A125325 _R. H. Hardin_, Dec 28 2006