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Search: id:A125438
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| A125438 |
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Number of base 26 circular n-digit numbers with adjacent digits differing by 7 or less. |
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+0
1
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| 1, 26, 334, 3554, 43902, 553306, 7135630, 93271834, 1231458766, 16376454818, 218938689224, 2938429752768, 39550154759946, 533443662253450, 7205953681467518, 97448916863238514, 1318905084028233358
(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)+F(7) for base>=7.int(n/2)+1 and F(d) is the largest coefficient in (1+x+...+x^(2d))^n
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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]`-$[(i+1)mod N]`>7)+($[(i+1)mod N]`-$[i]`>7))
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CROSSREFS
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Sequence in context: A010942 A022621 A085743 this_sequence A126919 A035708 A042306
Adjacent sequences: A125435 A125436 A125437 this_sequence A125439 A125440 A125441
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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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