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Search: id:A124954
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| A124954 |
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Number of base 26 circular n-digit numbers with adjacent digits differing by 2 or less. |
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+0
1
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| 1, 26, 124, 464, 2032, 8956, 40498, 185358, 857352, 3996572, 18748294, 88404078, 418649134, 1989796094, 9486867052, 45353726944, 217336589784, 1043666874012, 5021108669734, 24196986793782, 116781703334762
(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: A100162 A051729 A100163 this_sequence A126413 A044358 A044739
Adjacent sequences: A124951 A124952 A124953 this_sequence A124955 A124956 A124957
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhhardin(AT)att.net), Dec 28 2006
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