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A187522 Number of 3X3 0..n arrays with the array of 2X2 subblock determinants antisymmetric and no off-diagonal 2X2 subblock determinant zero.

%I A187522 #7 Jul 22 2025 10:47:57
%S A187522 6,98,450,1590,3426,8546,13992,26158,41748,67588,90082,148792,187474,
%T A187522 260222,355100,480620,569610,778354,903974,1192760,1466488,1766846,
%U A187522 1994060,2603040,2993262,3493594,4070056,4892770,5366122,6633208,7221322
%N A187522 Number of 3X3 0..n arrays with the array of 2X2 subblock determinants antisymmetric and no off-diagonal 2X2 subblock determinant zero.
%C A187522 Row 2 of A187521
%H A187522 R. H. Hardin, <a href="/A187522/b187522.txt">Table of n, a(n) for n = 1..53</a>
%e A187522 Some solutions for 3X3
%e A187522 ..0..0..3....2..2..2....2..1..2....3..3..3....0..3..2....2..3..2....1..1..1
%e A187522 ..3..3..2....1..1..2....2..1..1....3..3..1....0..2..2....2..3..0....2..2..0
%e A187522 ..0..3..2....3..1..2....3..2..2....1..3..1....1..1..1....0..3..0....0..1..0
%K A187522 nonn
%O A187522 1,1
%A A187522 _R. H. Hardin_ Mar 10 2011