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A125440
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Number of base 28 circular n-digit numbers with adjacent digits differing by 7 or less.
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0
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1, 28, 364, 3892, 48412, 614068, 7972636, 104937364, 1395605212, 18702818716, 252094162664, 3412942474992, 46361084525644, 631380551380516, 8615433816724714, 117735819504461662, 1610758432389050988
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| [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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PROG
| (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
| Sequence in context: A085744 A163719 A138452 * A122732 A010944 A022623
Adjacent sequences: A125437 A125438 A125439 * A125441 A125442 A125443
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KEYWORD
| nonn,base
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net), Dec 28 2006
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