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Number of (n+1)X(n+1) 0..1 arrays with each row divisible by 3 and column not divisible by 3, read as a binary number with top and left being the most significant bits.
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%I #4 Sep 22 2015 09:26:00

%S 2,4,270,18228,9401742,15231780324,114043973318270,

%T 3210825131209677780,376663000295700912108942,

%U 173793136176160952800090974444,324528460592527213101965898811701630

%N Number of (n+1)X(n+1) 0..1 arrays with each row divisible by 3 and column not divisible by 3, read as a binary number with top and left being the most significant bits.

%C Diagonal of A262420.

%e Some solutions for n=4

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

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

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

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

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

%Y Cf. A262420.

%K nonn

%O 1,1

%A _R. H. Hardin_, Sep 22 2015