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Search: id:A125372
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| A125372 |
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Number of base 9 circular n-digit numbers with adjacent digits differing by 5 or less. |
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+0
1
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| 1, 9, 69, 489, 3773, 29359, 229371, 1793675, 14030597, 109759917, 858660839, 6717419531, 52551380915, 411117567181, 3216236722495, 25161121675789, 196839383096437, 1539905230937741, 12046919094905577, 94244929368967819
(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: A120306 A089379 A072258 this_sequence A165147 A075045 A081616
Adjacent sequences: A125369 A125370 A125371 this_sequence A125373 A125374 A125375
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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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