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A125430
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Number of base 18 circular n-digit numbers with adjacent digits differing by 7 or less.
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0
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1, 18, 214, 2202, 25862, 310258, 3787948, 46645456, 577150510, 7159272162, 88927443434, 1105386497794, 13745406254372, 170957599435056, 2126500579257954, 26452521788330842, 329064936891773982
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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(7) for base>=7.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]`-$[(i+1)mod N]`>7)+($[(i+1)mod N]`-$[i]`>7))
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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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