login
Number of (n+2)X(2+2) 0..2 arrays with each row and column divisible by 13, read as a base-3 number with top and left being the most significant digits.
1

%I #4 Oct 15 2015 06:53:41

%S 7,19,57,409,2047,10747,70423,427507,2610075,16811257,106973797,

%T 685280521,4472908837,29110775719,191077482297,1268190506821,

%U 8394627812935,56013012538219,376887163063705,2528646896288971

%N Number of (n+2)X(2+2) 0..2 arrays with each row and column divisible by 13, read as a base-3 number with top and left being the most significant digits.

%C Column 2 of A263337.

%H R. H. Hardin, <a href="/A263335/b263335.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

%e ..0..2..2..2....1..1..1..0....1..2..2..1....0..0..0..0....0..2..2..2

%e ..1..2..2..1....0..2..2..2....2..1..0..2....0..1..1..1....1..2..2..1

%e ..1..1..1..0....1..1..1..0....1..2..2..1....0..0..0..0....2..2..2..0

%e ..1..1..1..0....0..2..2..2....2..1..0..2....0..1..1..1....2..2..2..0

%e ..0..1..1..1....1..1..1..0....1..2..2..1....0..0..0..0....1..2..2..1

%e ..0..2..2..2....0..2..2..2....2..1..0..2....0..1..1..1....0..2..2..2

%Y Cf. A263337.

%K nonn

%O 1,1

%A _R. H. Hardin_, Oct 15 2015