A253483 - OEIS

%I #5 Jan 02 2015 10:24:59

%S 558,6804,85464,1069400,13402934,167888152,2103506918,26352981590,

%T 330164967962,4136436492474,51823165353050,649263096931468,

%U 8134255022736090,101909518812574074,1276767300743745726

%N Number of (2+1)X(n+1) 0..2 arrays with every 2X2 subblock ne-sw antidiagonal difference unequal to its neighbors horizontally and nw+se diagonal sum unequal to its neighbors vertically

%C Row 2 of A253482

%H R. H. Hardin, <a href="/A253483/b253483.txt">Table of n, a(n) for n = 1..210</a>

%H R. H. Hardin, <a href="/A253483/a253483.txt">Empirical recurrence of order 90</a>

%F Empirical recurrence of order 90 (see link above)

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 02 2015