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A125403
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Number of base 15 circular n-digit numbers with adjacent digits differing by 6 or less.
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0
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1, 15, 153, 1359, 13733, 141695, 1486035, 15703213, 166605917, 1771212519, 18849404803, 200701390047, 2137554688991, 22768882319185, 242546650726001, 2583827618792249, 27525752610673389, 293236893096648653
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OFFSET
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0,2
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COMMENTS
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[Empirical] a(base,n)=a(base-1,n)+F(6) for base>=6.int(n/2)+1 and F(d) is the largest coefficient in (1+x+...+x^(2d))^n
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LINKS
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PROG
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(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>6)+($[(i+1)mod N]`-$[i]`>6))
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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