A124851 - OEIS

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A124851

Number of base 9 circular n-digit numbers with adjacent digits differing by 2 or less.

1, 9, 39, 141, 587, 2479, 10731, 47063, 208547, 931047, 4180239, 18849103, 85269011, 386687375, 1756855951, 7993210831, 36405316227, 165940691695, 756832203759, 3453347063599, 15762537566627, 71964915505967 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`[Empirical] a(base,n)=a(base-1,n)+A005191(n+1) for base>=2.int(n/2)+1`
	PROG	(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>2)+($[(i+1)mod N]`-$[i]`>2))
	CROSSREFS	`Sequence in context: A139594 A034263 A060929 * A124041 A126396 A075210` `Adjacent sequences: A124848 A124849 A124850 * A124852 A124853 A124854`
	KEYWORD	`nonn,base`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net), Dec 28 2006`

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Last modified February 16 08:13 EST 2012. Contains 205893 sequences.