login
This site is supported by donations to The OEIS Foundation.

 

Logo

Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A196643 Number of nX5 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 1,3,4,0,2 for x=0,1,2,3,4 1
1, 17, 116, 667, 4273, 25118, 160347, 983193, 6087268, 37645887, 232843313, 1440449688, 8908661143, 55104054837, 340834463434, 2108162310301, 13039609400629, 80653777800732, 498867623140685, 3085643335339211 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Every 0 is next to 0 1's, every 1 is next to 1 3's, every 2 is next to 2 4's, every 3 is next to 3 0's, every 4 is next to 4 2's

Column 5 of A196646

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n) = 2*a(n-1) +16*a(n-2) +43*a(n-3) +95*a(n-4) +148*a(n-5) -188*a(n-6) -431*a(n-7) +132*a(n-8) +150*a(n-9) -65*a(n-11) +62*a(n-12) -107*a(n-13) +45*a(n-14) +24*a(n-15) -4*a(n-16) -a(n-17) -a(n-18)

EXAMPLE

Some solutions for n=4

..0..0..0..3..0....0..0..0..3..0....0..0..0..0..0....0..3..0..0..0

..0..0..0..0..0....0..3..3..0..0....0..0..0..0..3....0..0..0..0..0

..0..0..0..0..0....3..0..0..0..0....0..0..0..0..0....3..0..0..0..3

..0..0..3..0..0....0..3..0..3..0....0..3..0..3..0....0..3..0..0..0

CROSSREFS

Sequence in context: A070144 A070209 A070136 * A196598 A222370 A032692

Adjacent sequences:  A196640 A196641 A196642 * A196644 A196645 A196646

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 04 2011

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified September 17 07:07 EDT 2014. Contains 246836 sequences.