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Number of n X n 0..2 arrays with no element equal to any value at offset (0,-1), (-1,-2) or (-2,0) and new values introduced in order 0..2.
0

%I #6 Apr 21 2020 12:41:54

%S 1,6,46,570,11624,421793,26631796,2976710318,583268028453,

%T 200678789857876,121566258532250545,129693591124665273124,

%U 243968254768827185678164

%N Number of n X n 0..2 arrays with no element equal to any value at offset (0,-1), (-1,-2) or (-2,0) and new values introduced in order 0..2.

%C Diagonal of A275037.

%e Some solutions for n=4

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

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

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

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

%Y Cf. A275037.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jul 14 2016