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Number of (n+1)X(2+1) 0..2 arrays with each row nonprime and column prime, read as a base 3 number with top and left being the most significant digits.
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%I #3 Sep 11 2015 09:41:01

%S 26,195,1968,18933,186780,2019171,23371442

%N Number of (n+1)X(2+1) 0..2 arrays with each row nonprime and column prime, read as a base 3 number with top and left being the most significant digits.

%C Column 2 of A262109.

%e Some solutions for n=4

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

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

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

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

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

%Y Cf. A262109.

%K nonn

%O 1,1

%A _R. H. Hardin_, Sep 11 2015