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Search: id:A124857
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| A124857 |
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Number of base 11 circular n-digit numbers with adjacent digits differing by 2 or less. |
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+0
1
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| 1, 11, 49, 179, 757, 3241, 14233, 63333, 284877, 1291697, 5894119, 27031653, 124481521, 575160311, 2664800299, 12374329729, 57568895517, 268238883291, 1251429223153, 5844466935453, 27318547433927, 127784523940077
(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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Adjacent sequences: A124854 A124855 A124856 this_sequence A124858 A124859 A124860
Sequence in context: A008780 A101992 A003063 this_sequence A126398 A026618 A026684
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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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