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Search: id:A125403
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| A125403 |
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Number of base 15 circular n-digit numbers with adjacent digits differing by 6 or less. |
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+0
1
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| 1, 15, 153, 1359, 13733, 141695, 1486035, 15703213, 166605917, 1771212519, 18849404803, 200701390047, 2137554688991, 22768882319185, 242546650726001, 2583827618792249, 27525752610673389, 293236893096648653
(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)+F(6) for base>=6.int(n/2)+1, and F(d) is the largest coefficient in (1+x+...+x^(2d))^n
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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]`-$[(i+1)mod N]`>6)+($[(i+1)mod N]`-$[i]`>6))
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CROSSREFS
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Sequence in context: A041424 A021124 A004322 this_sequence A010035 A017389 A098685
Adjacent sequences: A125400 A125401 A125402 this_sequence A125404 A125405 A125406
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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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