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

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A185570 Number of (n+1)X4 0..3 arrays with every 2X2 subblock sum equal to some horizontal or vertical neighbor 2X2 subblock sum 0
1936, 319448, 13565936, 886180500, 48714917964, 2946419096704, 170291132595760, 10155464818201668 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A185571

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for 3X4

..2..1..2..2....2..0..1..2....2..2..0..2....2..2..1..1....0..3..2..0

..2..1..2..0....0..1..1..1....0..1..2..2....0..2..1..2....0..2..0..3

..1..0..1..3....1..3..0..3....3..1..1..1....3..0..2..0....0..3..2..0

CROSSREFS

Sequence in context: A227491 A237010 A188369 * A031766 A031632 A031542

Adjacent sequences:  A185567 A185568 A185569 * A185571 A185572 A185573

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 31 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 November 27 16:30 EST 2014. Contains 250240 sequences.