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 A124998 #12 Apr 30 2025 14:55:04
%S A124998 1,32,154,578,2542,11242,51004,234168,1086342,5078522,23889964,
%T A124998 112953048,536316184,2555650688,12215701582,58545624238,281245522518,
%U A124998 1353858728442,6529181968828,31539774822672,152581524133232
%N A124998 Number of base 32 circular n-digit numbers with adjacent digits differing by 2 or less.
%C A124998 [Empirical] a(base,n)=a(base-1,n)+A005191(n+1) for base>=2.int(n/2)+1.
%C A124998 See A285280 for confirmation of linear recurrence and code to produce sequence. - _Ray Chandler_, Aug 12 2023.
%H A124998 Ray Chandler, <a href="/A124998/b124998.txt">Table of n, a(n) for n = 0..99</a>
%H A124998 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>
%H A124998 <a href="/index/Rec#order_31">Index entries for linear recurrences with constant coefficients</a>, signature (32, -435, 3190, -12761, 19684, 48086, -258700, 231499, 837384, -1863852, -875664, 5434855, -1213796, -9107594, 4936580, 9823160, -7075200, -7101166, 5814524, 3467879, -2974948, -1126675, 951098, 234114, -182448, -28910, 19180, 1855, -924, -49, 14).
%o A124998 (S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>2)+($[(i+1)mod N]`-$[i]`>2))
%Y A124998 Cf. Row 32 of A285280.
%K A124998 nonn,base
%O A124998 0,2
%A A124998 _R. H. Hardin_, Dec 28 2006