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Search: id:A125428
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| A125428 |
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Number of base 16 circular n-digit numbers with adjacent digits differing by 7 or less. |
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+0
1
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| 1, 16, 184, 1864, 21352, 249496, 2954044, 35167876, 419756872, 5015971864, 59971194884, 717190706556, 8577760468228, 102596987977708, 1227170820007330, 14678437539684814, 175572556087135224
(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: A016909 A001455 A016298 this_sequence A016249 A021049 A067308
Adjacent sequences: A125425 A125426 A125427 this_sequence A125429 A125430 A125431
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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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