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A124935
Number of base 18 circular n-digit numbers with adjacent digits differing by 2 or less.
2
1, 18, 84, 312, 1352, 5908, 26490, 120278, 552032, 2553972, 11892734, 55672118, 261759734, 1235323302, 5848421012, 27764530552, 132124679472, 630077734772, 3010344270942, 14406602755262, 69048608938842, 331383832210022
OFFSET
0,2
COMMENTS
[Empirical] a(base,n)=a(base-1,n)+A005191(n+1) for base>=2.int(n/2)+1.
See A285280 for confirmation of linear recurrence and code to produce sequence. - Ray Chandler, Aug 12 2023.
LINKS
Index entries for linear recurrences with constant coefficients, signature (18, -120, 320, 14, -1624, 1767, 2860, -4610, -2408, 4913, 1016, -2500, -200, 580, 16, -48).
PROG
(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))
CROSSREFS
Cf. Row 18 of A285280.
Sequence in context: A067984 A372400 A281372 * A126405 A250101 A141842
KEYWORD
nonn,base
AUTHOR
R. H. Hardin, Dec 28 2006
STATUS
approved