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Search: id:A124893
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| A124893 |
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Number of base 15 circular n-digit numbers with adjacent digits differing by 2 or less. |
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+0
1
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| 1, 15, 69, 255, 1097, 4765, 21237, 95873, 437537, 2012997, 9321899, 43397633, 202926209, 952396005, 4484003747, 21168581905, 100170213121, 474981809053, 2256307682541, 10735210220803, 51148724456627, 244007372314919
(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: A124890 A124891 A124892 this_sequence A124894 A124895 A124896
Sequence in context: A062392 A015876 A085474 this_sequence A126402 A053134 A000475
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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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