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Search: id:A125319
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| A125319 |
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Number of base 9 circular n-digit numbers with adjacent digits differing by 3 or less. |
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+0
1
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| 1, 9, 51, 249, 1387, 7879, 45663, 267367, 1575395, 9316455, 55211811, 327600447, 1945195699, 11554693471, 68652279747, 407952680479, 2424365629955, 14408066169471, 85629681584835, 508919764066431, 3024669695471107
(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)+A025012(n+1) for base>=3.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]`-$[(i+1)mod N]`>3)+($[(i+1)mod N]`-$[i]`>3))
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CROSSREFS
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Sequence in context: A061178 A097789 A080624 this_sequence A080621 A027218 A126477
Adjacent sequences: A125316 A125317 A125318 this_sequence A125320 A125321 A125322
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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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