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A204069 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order.

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%I A204069 #7 Jul 22 2025 17:44:59
%S A204069 8,329,45056,19934369,28864215128,137884925726873,2183735443548857744,
%T A204069 115025778364437876962225,20195410108776255562409533352,
%U A204069 11837286998861556208797264551862761
%N A204069 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order.
%C A204069 Diagonal of A204076
%e A204069 Some solutions for n=4
%e A204069 ..0..1..1..1..2....0..0..0..0..1....0..1..0..2..2....0..0..0..0..1
%e A204069 ..1..2..1..2..0....1..0..0..1..2....0..0..2..1..2....0..2..0..1..2
%e A204069 ..1..1..2..2..2....1..1..0..0..1....1..0..0..2..0....0..0..0..0..1
%e A204069 ..1..2..2..1..2....0..1..1..0..0....2..1..0..0..2....1..0..2..0..0
%e A204069 ..0..1..2..2..1....1..0..1..1..0....2..2..1..0..0....1..1..0..2..0
%K A204069 nonn
%O A204069 1,1
%A A204069 _R. H. Hardin_ Jan 10 2012

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