login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A208423 Number of 6Xn 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 0 1 1 vertically 1
18, 324, 1278, 10098, 55404, 365094, 2187162, 13759164, 84389022, 524422458, 3236767200, 20048681286, 123951850866, 767084787144, 4744724741082, 29355963846786, 181601409572100, 1123505977913586, 6950462612268942 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 6 of A208420

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = a(n-1) +35*a(n-2) +18*a(n-3) -225*a(n-4) -67*a(n-5) +494*a(n-6) +85*a(n-7) -455*a(n-8) -40*a(n-9) +178*a(n-10) +6*a(n-11) -24*a(n-12)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A207486 A207267 A207911 * A207783 A207022 A207366

Adjacent sequences:  A208420 A208421 A208422 * A208424 A208425 A208426

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 26 2012

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 January 26 11:22 EST 2022. Contains 350598 sequences. (Running on oeis4.)