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 A262325 Number of (n+1)X(n+1) 0..1 arrays with each row and column divisible by 3, read as a binary number with top and left being the most significant bits. 1

%I #5 Sep 18 2015 07:31:22

%S 2,5,90,2399,570922,394241389,1456404454010,19392931688071671,

%T 1134083007177482717802,256890679674803015904974405,

%U 239672757231397671662393429466490

%N Number of (n+1)X(n+1) 0..1 arrays with each row and column divisible by 3, read as a binary number with top and left being the most significant bits.

%C Diagonal of A262332.

%H R. H. Hardin, <a href="/A262325/b262325.txt">Table of n, a(n) for n = 1..12</a>

%e Some solutions for n=4

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

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

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

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

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

%Y Cf. A262332.

%K nonn

%O 1,1

%A _R. H. Hardin_, Sep 18 2015

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Last modified February 23 18:28 EST 2024. Contains 370283 sequences. (Running on oeis4.)