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Search: id:A125378
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| A125378 |
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Number of base 15 circular n-digit numbers with adjacent digits differing by 5 or less. |
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+0
1
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| 1, 15, 135, 1035, 9115, 81965, 752499, 6987149, 65352323, 613987173, 5784275575, 54583999661, 515613103267, 4873612594333, 46083011633703, 435842257278845, 4122660268033347, 38999758933083437, 368950570808869143
(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: A023013 A036217 A022643 this_sequence A126536 A030056 A123955
Adjacent sequences: A125375 A125376 A125377 this_sequence A125379 A125380 A125381
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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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