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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A227674 Number of n X n 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(n+1) binary array having an odd sum, with rows and columns of the latter in lexicographically nondecreasing order 0
2, 16, 283, 11971, 1330361, 418147052, 392636087774, 1142471406383630 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A227679

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A000182 A009764 A189257 * A102599 A123744 A136796

Adjacent sequences:  A227671 A227672 A227673 * A227675 A227676 A227677

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 19 2013

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified February 20 16:25 EST 2018. Contains 299380 sequences. (Running on oeis4.)