%I #10 Aug 12 2023 10:42:37
%S 1,12,54,198,842,3622,15984,71468,323042,1472022,6751064,31123148,
%T 144092684,669468708,3119587196,14572658668,68216250402,319893194558,
%U 1502357897232,7064711394284,33257109397452,156701323391972
%N Number of base 12 circular n-digit numbers with adjacent digits differing by 2 or less.
%C [Empirical] a(base,n)=a(base-1,n)+A005191(n+1) for base>=2.int(n/2)+1.
%C See A285280 for confirmation of linear recurrence and code to produce sequence. - _Ray Chandler_, Aug 12 2023.
%H Ray Chandler, <a href="/A124858/b124858.txt">Table of n, a(n) for n = 0..99</a>
%H <a href="/index/Rec#order_11">Index entries for linear recurrences with constant coefficients</a>, signature (12, -45, 30, 134, -160, -141, 170, 59, -60, -9, 6).
%o (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 Cf. Row 12 of A285280.
%K nonn,base
%O 0,2
%A _R. H. Hardin_, Dec 28 2006