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 A125352 #9 Apr 30 2025 15:12:47
%S A125352 1,15,115,735,5435,40965,315991,2469909,19495747,154956453,1237813755,
%T A125352 9923510469,79762415747,642295225197,5178982417003,41798669030805,
%U A125352 337575342572995,2727627544083901,22046802610388635,178241899736229829
%N A125352 Number of base 15 circular n-digit numbers with adjacent digits differing by 4 or less.
%C A125352 [Empirical] a(base,n)=a(base-1,n)+A025014(n+1) for base>=4.int(n/2)+1
%H A125352 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 A125352 (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 A125352 nonn,base
%O A125352 0,2
%A A125352 _R. H. Hardin_, Dec 28 2006