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Search: id:A125431
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| A125431 |
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Number of base 19 circular n-digit numbers with adjacent digits differing by 7 or less. |
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+0
1
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| 1, 19, 229, 2371, 28117, 340639, 4206175, 52452531, 657946661, 8280460237, 104408596879, 1317891532471, 16644977894179, 210297040134369, 2657451892030143, 33584889901686421, 424471412263606133
(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: A087607 A041688 A140843 this_sequence A104116 A028026 A135487
Adjacent sequences: A125428 A125429 A125430 this_sequence A125432 A125433 A125434
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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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