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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A187625 Number of 3X3 0..n arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation 2

%I

%S 24,446,2924,12104,37448,98014,221640,457632,871712,1562702,2649632,

%T 4329136,6782660,10323450,15291860,22111560,31246860,43422938,

%U 59215112,79658992,105617736,138251814,178796912,229108212,290437464,364933542

%N Number of 3X3 0..n arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation

%C Row 2 of A187624

%H R. H. Hardin, <a href="/A187625/b187625.txt">Table of n, a(n) for n = 1..35</a>

%e Some n=3 solutions for 3X3

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

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

%e ..3..0..3....3..0..3....2..2..2....3..3..1....0..1..3....1..2..2....1..3..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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified November 27 06:29 EST 2021. Contains 349363 sequences. (Running on oeis4.)