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A125358
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Number of base 21 circular n-digit numbers with adjacent digits differing by 4 or less.
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0
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1, 21, 169, 1101, 8369, 64671, 511957, 4108671, 33331889, 272616609, 2244091579, 18568201871, 154285123493, 1286408940149, 10756655080753, 90159207784161, 757192897525073, 6369787770505701, 53659598197631131, 452559057596166759
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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)+A025014(n+1) for base>=4.int(n/2)+1
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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]`-$[(i+1)mod N]`>4)+($[(i+1)mod N]`-$[i]`>4))
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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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