The On-Line Encyclopedia of Integer Sequences (OEIS)

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A125325

Number of base 15 circular n-digit numbers with adjacent digits differing by 3 or less.
(history; published version)

#7 by Russ Cox at Sat Mar 31 12:35:01 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net), _, Dec 28 2006

Discussion

Sat Mar 31

12:35

OEIS Server: https://oeis.org/edit/global/875

#6 by Charles R Greathouse IV at Mon Nov 15 22:57:47 EST 2010

STATUS

proposed

approved

#5 by Charles R Greathouse IV at Mon Nov 15 22:57:45 EST 2010

KEYWORD

nonn,base,new

STATUS

approved

proposed

#4 by N. J. A. Sloane at Sat Oct 02 03:00:00 EDT 2010

KEYWORD

nonn,new

nonn

AUTHOR

Ron R. H. Hardin (rhhardin(AT)att.net), Dec 28 2006

#3 by N. J. A. Sloane at Fri Jan 09 03:00:00 EST 2009

KEYWORD

nonn,new

nonn

AUTHOR

Ron Hardin (rhhrhhardin(AT)cadenceatt.comnet), Dec 28 2006

#2 by N. J. A. Sloane at Sat Nov 10 03:00:00 EST 2007

COMMENTS

[empiricalEmpirical] a(base,n)=a(base-1,n)+A025012(n+1) for base>=3.int(n/2)+1

KEYWORD

nonn,new

nonn

#1 by N. J. A. Sloane at Fri Jan 12 03:00:00 EST 2007

NAME

Number of base 15 circular n-digit numbers with adjacent digits differing by 3 or less.

DATA

1, 15, 93, 471, 2773, 16585, 101649, 631513, 3965717, 25103901, 159916563, 1023792939, 6580680769, 42436151201, 274373773501, 1777776831901, 11538964492821, 75001583213817, 488059829837697, 3178929941530215

OFFSET

0,2

COMMENTS

[empirical] a(base,n)=a(base-1,n)+A025012(n+1) for base>=3.int(n/2)+1

PROG

(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>3)+($[(i+1)mod N]`-$[i]`>3))

KEYWORD

nonn

AUTHOR

Ron Hardin (rhh(AT)cadence.com), Dec 28 2006

STATUS

approved