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A186087 Number of (n+2)X(n+2) 0..4 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order.

%I A186087 #7 Jul 22 2025 10:13:58
%S A186087 102251,22559052,4527262140,837192826927,142701733009836,
%T A186087 22643128901373831,3389319838308873682,482195323502778740280,
%U A186087 65081669155365981380613,8294413388145189171875895
%N A186087 Number of (n+2)X(n+2) 0..4 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order.
%C A186087 Diagonal of A186096
%e A186087 Some solutions for 4X4
%e A186087 ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
%e A186087 ..0..0..1..2....0..0..0..1....0..0..1..3....0..0..0..3....0..0..1..3
%e A186087 ..0..2..2..4....0..0..1..2....0..1..0..2....0..2..3..3....0..1..1..1
%e A186087 ..3..4..2..4....3..3..0..1....0..4..3..0....2..4..3..1....2..4..2..3
%K A186087 nonn
%O A186087 1,1
%A A186087 _R. H. Hardin_ Feb 12 2011