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Search: id:A125442
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| A125442 |
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Number of base 30 circular n-digit numbers with adjacent digits differing by 7 or less. |
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+0
1
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| 1, 30, 394, 4230, 52922, 674830, 8809642, 116602894, 1559751802, 21029229666, 285256118294, 3887818433694, 53185566799370, 729717040661210, 10035018502900680, 138252138183877000, 1907423508604126538
(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(7) for base>=7.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]`-$[(i+1)mod N]`>7)+($[(i+1)mod N]`-$[i]`>7))
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CROSSREFS
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Adjacent sequences: A125439 A125440 A125441 this_sequence A125443 A125444 A125445
Sequence in context: A042748 A022690 A020927 this_sequence A010835 A022722 A126922
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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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