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Search: id:A125427
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| A125427 |
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Number of base 15 circular n-digit numbers with adjacent digits differing by 7 or less. |
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+0
1
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| 1, 15, 169, 1695, 19097, 219115, 2540413, 29568547, 344726553, 4021721265, 46932054649, 547742536301, 6392983509989, 74617206197211, 870919028712223, 10165247714847775, 118647535970217257, 1384840366115001717
(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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Sequence in context: A121116 A138973 A016177 this_sequence A016279 A036734 A016172
Adjacent sequences: A125424 A125425 A125426 this_sequence A125428 A125429 A125430
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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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