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A125483
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Number of base 26 circular n-digit numbers with adjacent digits differing by 9 or less.
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0
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1, 26, 404, 5336, 81104, 1259576, 19967936, 320169512, 5171292032, 83900196944, 1364972167264, 22244133830384, 362871115920320, 5923247233768800, 96723397586353984, 1579802606359113536, 25806819552006704128
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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(9) for base>=9.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]`-$[(i+1)mod N]`>9)+($[(i+1)mod N]`-$[i]`>9))
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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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