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Search: id:A125381
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| A125381 |
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Number of base 18 circular n-digit numbers with adjacent digits differing by 5 or less. |
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+0
1
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| 1, 18, 168, 1308, 11788, 108368, 1019238, 9713414, 93465716, 905458656, 8814132218, 86094716902, 842995538722, 8268296567458, 81194927188214, 798010003387898, 7847743232008148, 77207807539770572, 759807537336050712
(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(5) for base>=5.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]`-$[(i+1)mod N]`>5)+($[(i+1)mod N]`-$[i]`>5))
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CROSSREFS
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Sequence in context: A041618 A055915 A071539 this_sequence A126539 A139618 A010970
Adjacent sequences: A125378 A125379 A125380 this_sequence A125382 A125383 A125384
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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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