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!)
A187623 Number of (n+1)X(n+1) 0..3 arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation 0

%I #4 Mar 31 2012 12:36:09

%S 64,2924,390,12278892,4232368

%N Number of (n+1)X(n+1) 0..3 arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation

%C Column 3 of A187624

%e Some solutions for 4X4

%e ..1..0..2..3....1..1..0..1....1..3..2..3....2..1..0..2....1..2..1..2

%e ..3..1..1..1....0..1..1..1....0..1..1..1....0..1..1..2....0..1..1..1

%e ..1..1..1..3....1..1..1..0....1..1..1..0....1..1..1..1....1..1..1..0

%e ..3..2..0..1....2..1..2..1....3..2..3..1....2..0..1..3....2..1..2..1

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 12 2011

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 12:59 EDT 2024. Contains 371254 sequences. (Running on oeis4.)