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Search: id:A125473
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| A125473 |
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Number of base 16 circular n-digit numbers with adjacent digits differing by 9 or less. |
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+0
1
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| 1, 16, 214, 2626, 35338, 480386, 6560422, 89700102, 1226932234, 16784082754, 229609445214, 3141133904078, 42971898107398, 587872363583846, 8042326088300396, 110022206635195496, 1505147409633416538
(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(9) for base>=9.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]`-$[(i+1)mod N]`>9)+($[(i+1)mod N]`-$[i]`>9))
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CROSSREFS
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Sequence in context: A016159 A059385 A009440 this_sequence A138454 A086650 A137701
Adjacent sequences: A125470 A125471 A125472 this_sequence A125474 A125475 A125476
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhh(AT)cadence.com), Dec 28 2006
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