A261753 - OEIS

%I #4 Aug 31 2015 07:15:24

%S 2,20,19,2673,7014,8124875,78901198

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

%C Diagonal of A261761.

%e Some solutions for n=4

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

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

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

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

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

%Y Cf. A261761.

%K nonn

%O 1,1

%A _R. H. Hardin_, Aug 31 2015