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Search: id:A124711
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| A124711 |
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Number of base 18 circular n-digit numbers with adjacent digits differing by 1 or less. |
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+0
1
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| 1, 18, 52, 120, 320, 848, 2314, 6374, 17752, 49800, 140582, 398834, 1136270, 3248718, 9316828, 26790080, 77212552, 222993608, 645193126, 1869809474, 5426815810, 15771487250, 45891045208, 133679744924, 389803622998
(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: A093520 A051870 A069130 this_sequence A126372 A133356 A052495
Adjacent sequences: A124708 A124709 A124710 this_sequence A124712 A124713 A124714
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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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