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Search: id:A125422
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| A125422 |
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Number of base 10 circular n-digit numbers with adjacent digits differing by 7 or less. |
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+0
1
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| 1, 10, 94, 850, 8022, 75830, 717388, 6787364, 64217998, 607594090, 5748711994, 54391069402, 514617618420, 4869021638192, 46067936415154, 435868830209930, 4123945024124830, 39018441749664142, 369170487886312636
(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: A099295 A050793 A126633 this_sequence A125945 A044642 A125946
Adjacent sequences: A125419 A125420 A125421 this_sequence A125423 A125424 A125425
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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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