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

%I #3 Sep 06 2015 07:52:40

%S 0,2,5,12,31,57,112,296,833,1889,5015,11625,30782,80154,202448,526705,

%T 1410549,3698903

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

%C Column 2 of A261942.

%e Some solutions for n=4

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

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

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

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

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

%Y Cf. A261942.

%K nonn

%O 1,2

%A _R. H. Hardin_, Sep 06 2015