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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A187932 Number of (n+2)X3 binary arrays with every 2X2 subblock sum equal to some diagonal or antidiagonal neighbor 2X2 subblock sum 1
48, 44, 304, 784, 3188, 10296, 38020, 131184, 470896, 1657548, 5909972, 20946476, 74559876, 264925180, 942717628, 3352989040, 11932074280, 42457171692, 151103252592, 537762244964, 1914001892748, 6812367659852, 24247630683032 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A187940

LINKS

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

FORMULA

Empirical: a(n)=6*a(n-1)-5*a(n-2)-27*a(n-3)+76*a(n-4)-91*a(n-5)-51*a(n-6)+46*a(n-7)+7*a(n-8)+1378*a(n-9)-1195*a(n-10)+1324*a(n-11)-1078*a(n-12)-2750*a(n-13)-3729*a(n-14)-2433*a(n-15)-8936*a(n-16)+8415*a(n-17)+9599*a(n-18)-9292*a(n-19)+13722*a(n-20)-40054*a(n-21)-8978*a(n-22)-23008*a(n-23)+25496*a(n-24)+19792*a(n-25)+72996*a(n-26)+67912*a(n-27)-11848*a(n-28)-48960*a(n-29)-61120*a(n-30)-26816*a(n-31)+5440*a(n-32)+27904*a(n-33)+12544*a(n-34)-2048*a(n-35)-4096*a(n-36)

EXAMPLE

Some solutions for 4X3

..0..1..0....1..0..0....0..1..0....1..1..1....1..0..1....0..0..0....1..1..0

..1..1..1....0..1..1....1..0..1....0..1..0....0..0..0....1..1..1....0..1..1

..1..0..1....1..0..0....0..1..0....1..1..1....1..0..1....0..0..0....1..1..0

..1..1..1....0..1..1....1..0..1....0..1..0....0..0..0....1..1..1....0..1..1

CROSSREFS

Sequence in context: A156461 A300143 A187940 * A165869 A121377 A327894

Adjacent sequences:  A187929 A187930 A187931 * A187933 A187934 A187935

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 16 2011

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 20 02:03 EDT 2019. Contains 328244 sequences. (Running on oeis4.)