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A203978 Number of (n+1)X(n+1) 0..2 arrays with no 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 A203978 #7 Jul 22 2025 17:42:18
%S A203978 6,144,7776,956448,271918944,180709558848,281455764775776,
%T A203978 1031010515432951328,8894627860916158754400,
%U A203978 180980943906416856129607680
%N A203978 Number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order.
%C A203978 Diagonal of A203984
%e A203978 Some solutions for n=4
%e A203978 ..0..1..0..2..1....0..1..1..1..1....0..0..0..1..1....0..0..0..0..1
%e A203978 ..2..1..0..2..0....2..2..2..2..0....2..2..2..2..2....1..1..1..2..1
%e A203978 ..0..1..0..2..0....1..0..1..1..0....0..0..0..0..1....0..0..0..0..0
%e A203978 ..2..1..0..1..1....1..0..2..2..2....1..1..1..2..1....1..2..1..1..1
%e A203978 ..2..1..0..2..2....1..0..1..0..1....0..2..0..2..0....1..2..0..2..2
%K A203978 nonn
%O A203978 1,1
%A A203978 _R. H. Hardin_ Jan 09 2012

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