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A204623 Number of (n+1)X2 0..2 arrays with every 2X2 subblock having unequal diagonal elements or unequal antidiagonal elements, and new values 0..2 introduced in row major order 3

%I

%S 12,96,768,6144,49152,393216,3145728,25165824,201326592,1610612736,

%T 12884901888,103079215104,824633720832,6597069766656,52776558133248,

%U 422212465065984,3377699720527872,27021597764222976,216172782113783808

%N Number of (n+1)X2 0..2 arrays with every 2X2 subblock having unequal diagonal elements or unequal antidiagonal elements, and new values 0..2 introduced in row major order

%C Column 1 of A204630

%H R. H. Hardin, <a href="/A204623/b204623.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 8*a(n-1)

%e Some solutions for n=3

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

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

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

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

%Y Cf. A094085, A270568.

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 17 2012

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Last modified November 13 20:57 EST 2019. Contains 329106 sequences. (Running on oeis4.)