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A210899 Number of n X n 0..2 symmetric matrices with every element equal to one or two horizontal and vertical neighbors, and new values 0..2 introduced in lower triangle row major order 0

%I

%S 0,1,2,36,1044,74379,10881920,3566285692,2524146683822,

%T 3922290803244487,13291420623117002040,98512903545177272401383

%N Number of n X n 0..2 symmetric matrices with every element equal to one or two horizontal and vertical neighbors, and new values 0..2 introduced in lower triangle row major order

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,3

%A _R. H. Hardin_ Mar 29 2012

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Last modified January 16 19:48 EST 2022. Contains 350376 sequences. (Running on oeis4.)