login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A227258 Number of n X n 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(n+1) binary array having a sum of two or less, with rows and columns of the latter in lexicographically nondecreasing order 0

%I

%S 2,9,98,2201,112349,13855163,4307345460

%N Number of n X n 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(n+1) binary array having a sum of two or less, with rows and columns of the latter in lexicographically nondecreasing order

%C Diagonal of A227263

%e Some solutions for n=4

%e ..1..1..1..0....1..1..1..1....1..1..1..1....1..1..1..0....1..1..0..0

%e ..1..0..0..1....1..0..1..1....1..0..1..1....1..0..0..0....1..1..1..0

%e ..0..1..1..1....1..1..0..1....1..1..1..0....1..0..0..1....1..1..1..1

%e ..0..0..1..1....1..1..0..0....0..1..0..0....0..0..0..1....0..1..1..1

%K nonn

%O 1,1

%A _R. H. Hardin_ Jul 04 2013

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 July 31 21:39 EDT 2021. Contains 346377 sequences. (Running on oeis4.)