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Search: id:A124806
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| A124806 |
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Number of base 5 circular n-digit numbers with adjacent digits differing by 2 or less. |
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+0
1
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| 1, 5, 19, 65, 247, 955, 3733, 14649, 57583, 226505, 891219, 3507047, 13801285, 54313277, 213745019, 841177105, 3310392415, 13027820227, 51270096661, 201769982673, 794052091767, 3124938240153, 12297982928987, 48397879544975
(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: A025568 A001047 A099448 this_sequence A059509 A137745 A005021
Adjacent sequences: A124803 A124804 A124805 this_sequence A124807 A124808 A124809
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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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