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 A125347 #9 Apr 30 2025 15:11:24
%S A125347 1,10,70,430,2990,21210,152752,1107368,8054662,58680898,427841510,
%T A125347 3120550894,22764484280,166081792328,1211725839660,8840879076060,
%U A125347 64504607657222,470639150157006,3433889688841786,25054462942728214
%N A125347 Number of base 10 circular n-digit numbers with adjacent digits differing by 4 or less.
%C A125347 [Empirical] a(base,n)=a(base-1,n)+A025014(n+1) for base>=4.int(n/2)+1
%H A125347 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 A125347 (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 A125347 nonn,base
%O A125347 0,2
%A A125347 _R. H. Hardin_, Dec 28 2006