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Search: id:A124956
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| A124956 |
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Number of base 28 circular n-digit numbers with adjacent digits differing by 2 or less. |
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+0
1
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| 1, 28, 134, 502, 2202, 9718, 44000, 201628, 933682, 4357222, 20462184, 96587068, 457871484, 2178414292, 10396478562, 49751026042, 238639567362, 1147064158822, 5523799769432, 26644582803412, 128714976934252
(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: A044360 A044741 A123376 this_sequence A014705 A126415 A074233
Adjacent sequences: A124953 A124954 A124955 this_sequence A124957 A124958 A124959
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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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