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A125456
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Number of base 21 circular n-digit numbers with adjacent digits differing by 8 or less.
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0
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1, 21, 285, 3333, 44589, 609441, 8484027, 119207781, 1683956109, 23857954869, 338563579455, 4808766812871, 68334330572247, 971314874179749, 13808436456553037, 196319581589707923, 2791268881281069805
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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(8) for base>=8.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]`-$[(i+1)mod N]`>8)+($[(i+1)mod N]`-$[i]`>8))
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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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