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Search: id:A124864
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| A124864 |
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Number of base 13 circular n-digit numbers with adjacent digits differing by 2 or less. |
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+0
1
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| 1, 13, 59, 217, 927, 4003, 17735, 79603, 361207, 1652347, 7608009, 35214643, 163703859, 763777807, 3574392251, 16771283857, 78867271271, 371585266531, 1753627967177, 8287756490659, 39216985201477, 185770958749075
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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[Empirical] a(base,n)=a(base-1,n)+A005191(n+1) for base>=2.int(n/2)+1
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PROGRAM
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(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>2)+($[(i+1)mod N]`-$[i]`>2))
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CROSSREFS
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Sequence in context: A103220 A086221 A141917 this_sequence A126400 A002647 A118711
Adjacent sequences: A124861 A124862 A124863 this_sequence A124865 A124866 A124867
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhh(AT)cadence.com), Dec 28 2006
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