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!)
A252184 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 1 3 6 or 7 0

%I

%S 945,1886,3705,9233,24956,57629,147696,488200,1339760,4201296,

%T 53487944,243810896,1121545296,82644345928,442293577808

%N Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 1 3 6 or 7

%C Diagonal of A252192

%e Some solutions for n=4

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

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 15 2014

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 June 26 15:11 EDT 2022. Contains 354884 sequences. (Running on oeis4.)