A187464 - OEIS

%I #8 Oct 03 2025 03:59:44

%S 144,89618,5098224,100936174,1061948616,7706500654,41131010240,

%T 180898687166,670434819776,2192125079476,6398465414348,17262285779402

%N Number of 4X4 0..n arrays with all the 2X2 subblocks nonsingular and the array of 2X2 subblock determinants symmetric.

%C Row 3 of A187462

%K nonn

%O 1,1

%A _R. H. Hardin_, Mar 10 2011