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A192639 Number of n X n symmetric 0..2 arrays with each element equal to at least one horizontal or vertical neighbor and any new values 0..2 introduced in lower triangular row major order 0

%I

%S 0,1,5,120,7335,1156521,457780079,457756056728,1154866876506535,

%T 7352987974445171007,118143153320894808308264,

%U 4790379823545169735782598423,490170667588709471795216706934694

%N Number of n X n symmetric 0..2 arrays with each element equal to at least one horizontal or vertical neighbor and any new values 0..2 introduced in lower triangular row major order

%e Some solutions for 6X6 containing a 2

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

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

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

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

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

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

%K nonn

%O 1,3

%A _R. H. Hardin_ Jul 06 2011

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Last modified June 26 03:35 EDT 2022. Contains 354871 sequences. (Running on oeis4.)