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Search: id:A124958
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| A124958 |
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Number of base 30 circular n-digit numbers with adjacent digits differing by 2 or less. |
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+0
1
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| 1, 30, 144, 540, 2372, 10480, 47502, 217898, 1010012, 4717872, 22176074, 104770058, 497093834, 2367032490, 11306090072, 54148325140, 259942544940, 1250461443632, 6026490869130, 29092178813042, 140648250533742
(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: A117750 A158462 A064495 this_sequence A126417 A135175 A042760
Adjacent sequences: A124955 A124956 A124957 this_sequence A124959 A124960 A124961
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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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