Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #4 Sep 06 2015 07:52:14
%S 0,2,218,7943,5488030,1247810761
%N Number of (n+1)X(n+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 Diagonal of A261942.
%e Some solutions for n=4
%e ..1..1..0..1..0....0..0..0..0..1....0..0..1..1..0....0..0..1..0..0
%e ..1..1..1..0..0....1..1..0..0..0....1..0..1..0..0....1..0..0..0..0
%e ..1..1..0..1..0....0..0..0..0..0....0..0..1..0..0....0..1..0..1..0
%e ..0..1..1..1..1....1..1..1..1..0....1..1..0..0..1....1..0..1..0..1
%e ..1..1..1..1..0....1..1..0..0..1....1..1..1..1..0....1..1..1..1..0
%Y Cf. A261942.
%K nonn
%O 1,2
%A _R. H. Hardin_, Sep 06 2015