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Search: id:A125383
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| A125383 |
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Number of base 20 circular n-digit numbers with adjacent digits differing by 5 or less. |
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+0
1
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| 1, 20, 190, 1490, 13570, 125970, 1197064, 11530924, 112220506, 1100369066, 10850627100, 107452404508, 1067503597036, 10630932961084, 106062616838662, 1059608800292250, 10596747725262026, 106055136504646382
(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: A014806 A022615 A061180 this_sequence A126541 A027716 A126901
Adjacent sequences: A125380 A125381 A125382 this_sequence A125384 A125385 A125386
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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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