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Search: id:A124955
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| A124955 |
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Number of base 27 circular n-digit numbers with adjacent digits differing by 2 or less. |
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+0
1
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| 1, 27, 129, 483, 2117, 9337, 42249, 193493, 895517, 4176897, 19605239, 92495573, 438260309, 2084105193, 9941672807, 47552376493, 227988078573, 1095365516417, 5272454219583, 25420784798597, 122748340134507
(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: A044740 A026917 A048615 this_sequence A126414 A066414 A042422
Adjacent sequences: A124952 A124953 A124954 this_sequence A124956 A124957 A124958
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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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