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Search: id:A125390
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| A125390 |
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Number of base 27 circular n-digit numbers with adjacent digits differing by 5 or less. |
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+0
1
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| 1, 27, 267, 2127, 19807, 187577, 1819455, 17892209, 177862775, 1782622659, 17982655477, 182355459335, 1857132914971, 18980470449955, 194561703929167, 1999351722898547, 20588948151052007, 212398927095343597
(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: A016107 A101379 A132652 this_sequence A126548 A108670 A136925
Adjacent sequences: A125387 A125388 A125389 this_sequence A125391 A125392 A125393
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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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