A263052 - OEIS

%I #5 Oct 08 2015 14:56:37

%S 2,33,1666,498597,439260642,1825928130193,26380510465997186,

%T 1607516667474074649381,373842629115554331580791202,

%U 353418497958270475251697468005873

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

%C Diagonal of A263060.

%H R. H. Hardin, <a href="/A263052/b263052.txt">Table of n, a(n) for n = 1..11</a>

%e Some solutions for n=3

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

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

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

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

%Y Cf. A263060.

%K nonn

%O 1,1

%A _R. H. Hardin_, Oct 08 2015