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A208194 Number of n X n 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than two of its immediate leftward or upward or left-upward diagonal neighbors 1

%I

%S 1,14,10366,156617480,37069738362057,136398703432330477549,

%T 7801822458198433796561428608,6937084083184530563330081968289999750,

%U 95885498147917477608538934758547979039384601906

%N Number of n X n 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than two of its immediate leftward or upward or left-upward diagonal neighbors

%C Diagonal of A208201

%H R. H. Hardin, <a href="/A208194/b208194.txt">Table of n, a(n) for n = 1..10</a>

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Feb 24 2012

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Last modified February 4 10:00 EST 2023. Contains 360046 sequences. (Running on oeis4.)