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 A125328 #9 Apr 30 2025 15:04:22
%S A125328 1,18,114,582,3466,20938,129642,813586,5161418,33012690,212531034,
%T A125328 1375465890,8940439306,58322410658,381620168176,2503490173972,
%U A125328 16459423126778,108417784128158,715300322712000,4725856346389840
%N A125328 Number of base 18 circular n-digit numbers with adjacent digits differing by 3 or less.
%C A125328 [Empirical] a(base,n)=a(base-1,n)+A025012(n+1) for base>=3.int(n/2)+1
%H A125328 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 A125328 (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 A125328 nonn,base
%O A125328 0,2
%A A125328 _R. H. Hardin_, Dec 28 2006