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 A125365 #9 Apr 30 2025 15:16:50
%S A125365 1,28,232,1528,11792,92328,740584,6020560,49474064,409888240,
%T A125365 3418201292,28657884404,241330103336,2039837966168,17296465194604,
%U A125365 147063357683748,1253373089577936,10704229282080880,91584291381177844
%N A125365 Number of base 28 circular n-digit numbers with adjacent digits differing by 4 or less.
%C A125365 [Empirical] a(base,n)=a(base-1,n)+A025014(n+1) for base>=4.int(n/2)+1
%H A125365 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 A125365 (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 A125365 nonn,base
%O A125365 0,2
%A A125365 _R. H. Hardin_, Dec 28 2006