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 A125356 #9 Apr 30 2025 15:14:09
%S A125356 1,19,151,979,7391,56769,446635,3562417,28719839,233396143,1908631671,
%T A125356 15685438183,129415466639,1071158916743,8888586709041,73910874048609,
%U A125356 615613183193519,5134422106241421,42869268105031999,358244686255795945
%N A125356 Number of base 19 circular n-digit numbers with adjacent digits differing by 4 or less.
%C A125356 [Empirical] a(base,n)=a(base-1,n)+A025014(n+1) for base>=4.int(n/2)+1
%H A125356 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 A125356 (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 A125356 nonn,base
%O A125356 0,2
%A A125356 _R. H. Hardin_, Dec 28 2006