A206315 - OEIS

%I #5 Mar 31 2012 12:37:11

%S 418468,77132181,14309749540,2656145209648,492612276280514,

%T 91342748577948857,16933907482183625564,3139181759716837800994,

%U 581918239365125184573987,107870252944675279760828811

%N Number of (n+1)X6 0..3 arrays with the number of clockwise edge increases in every 2X2 subblock equal to two, and every 2X2 determinant nonzero

%C Column 5 of A206318

%H R. H. Hardin, <a href="/A206315/b206315.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

%e ..2..0..3..0..1..0....3..2..3..1..2..2....3..2..1..1..0..1....1..3..0..2..3..0

%e ..1..1..0..1..0..3....2..1..2..1..0..3....1..0..3..2..1..0....3..1..3..0..2..2

%e ..0..3..1..3..2..0....0..2..3..2..1..0....2..1..0..3..2..1....1..3..0..1..0..3

%e ..2..0..2..1..3..1....3..2..0..3..2..1....3..2..1..0..3..2....2..0..1..3..2..1

%e ..3..1..3..2..1..2....2..3..1..0..3..2....1..3..2..1..0..3....1..2..1..0..3..2

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 06 2012