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Number of n X 6 (-1,0,1) arrays of determinants of 2 X 2 subblocks of some (n+1) X 7 binary array.
1

%I #6 Mar 15 2023 11:42:48

%S 491,80043,6045209,439030021,34404755041,2753775365011,

%T 219013376708219,17350805966693235,1374728293480549343,

%U 108981170244590729059,8640242984064796760609,684976188236943531208499

%N Number of n X 6 (-1,0,1) arrays of determinants of 2 X 2 subblocks of some (n+1) X 7 binary array.

%C Column 6 of A226717.

%H R. H. Hardin, <a href="/A226715/b226715.txt">Table of n, a(n) for n = 1..29</a>

%e Some solutions for n=3

%e .-1.-1..0..0..1..0...-1.-1..0..1..0..0...-1.-1..0..1.-1..1...-1.-1..0..0.-1..1

%e ..1..1..0..0.-1..0....1..1..0.-1..1..1...-1..1..0.-1..0..0....0..1..0..0.-1..0

%e ..0..1.-1..0..1..0....0.-1..0..0..0.-1....1.-1..1..1..0.-1....1..0..0..0..1..0

%Y Cf. A226717.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jun 15 2013