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Search: id:A124712
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| A124712 |
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Number of base 19 circular n-digit numbers with adjacent digits differing by 1 or less. |
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+0
1
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| 1, 19, 55, 127, 339, 899, 2455, 6767, 18859, 52939, 149535, 424487, 1210059, 3461659, 9933055, 28577687, 82409179, 238128539, 689345935, 1998806327, 5804195179, 16876837979, 49132180735, 143192973047, 417751959379
(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)+A002426(n+1) for base>=1.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]`-$[(i+1)mod N]`>1)+($[(i+1)mod N]`-$[i]`>1))
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CROSSREFS
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Sequence in context: A044121 A044502 A069131 this_sequence A126373 A125818 A093362
Adjacent sequences: A124709 A124710 A124711 this_sequence A124713 A124714 A124715
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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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