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A126495
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Number of base 27 n-digit numbers with adjacent digits differing by three or less.
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2
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1, 27, 177, 1183, 7961, 53795, 364489, 2474351, 16821389, 114483903, 779844261, 5315901159, 36257137597, 247407046293, 1688869025869, 11532291728235, 78767464674013, 538108605910885, 3676788059570219, 25126354998525521
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listen;
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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)+7^(n-1) for base>=3n-2; a(base,n)=a(base-1,n)+7^(n-1)-2 when base=3n-3
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LINKS
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PROG
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(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>3)+($[i+1]`-$[i]`>3))
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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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