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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A184379 1/12 the number of (n+2)X4 0..2 arrays with each 3X3 subblock containing three of each value 1
545, 1494, 4281, 13616, 55386, 242370, 1165496, 6248040, 34487190, 195981866, 1145052186, 6737361360, 39912443060, 237978427224, 1421256784506, 8501521627826, 50931916877226, 305246808679080, 1830112280897396 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A184386

LINKS

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

FORMULA

Empirical: a(n)=12*a(n-1)-47*a(n-2)+184*a(n-3)-1380*a(n-4)+5264*a(n-5)-12447*a(n-6)+56628*a(n-7)-206001*a(n-8)+396180*a(n-9)-1125036*a(n-10)+3788388*a(n-11)-6578172*a(n-12)+12197952*a(n-13)-36410148*a(n-14)+59740416*a(n-15)-75446640*a(n-16)+186268896*a(n-17)-295472448*a(n-18)+264166272*a(n-19)-475844544*a(n-20)+739031040*a(n-21)-485409024*a(n-22)+473651712*a(n-23)-725594112*a(n-24)+362797056*a(n-25)

EXAMPLE

Some solutions with a(1,1)=0 for 6X4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A264948 A159626 A020259 * A053327 A252537 A099008

Adjacent sequences:  A184376 A184377 A184378 * A184380 A184381 A184382

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 12 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 September 20 20:12 EDT 2019. Contains 327247 sequences. (Running on oeis4.)