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Search: id:A125330
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| A125330 |
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Number of base 20 circular n-digit numbers with adjacent digits differing by 3 or less. |
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+0
1
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| 1, 20, 128, 656, 3928, 23840, 148304, 934968, 5958552, 38285216, 247607348, 1609914524, 10513615792, 68913452056, 453123210178, 2987405569166, 19741419610536, 130718419293680, 867078544410362, 5760352822741182
(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)+A025012(n+1) for base>=3.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]`-$[(i+1)mod N]`>3)+($[(i+1)mod N]`-$[i]`>3))
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CROSSREFS
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Sequence in context: A041770 A004634 A073968 this_sequence A126488 A005551 A006417
Adjacent sequences: A125327 A125328 A125329 this_sequence A125331 A125332 A125333
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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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