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A210925 Number of n X n 0..3 symmetric matrices with every element equal to zero, two or three horizontal and vertical neighbors, and new values 0..3 introduced in lower triangle row major order 0

%I #5 Dec 18 2015 18:18:06

%S 1,3,39,2212,314852,110451021,95121973827,200885189935045,

%T 1039262747697700932,13162671799070468638683

%N Number of n X n 0..3 symmetric matrices with every element equal to zero, two or three horizontal and vertical neighbors, and new values 0..3 introduced in lower triangle row major order

%e Some solutions for n=4

%e ..0..1..2..3....0..1..2..3....0..1..0..1....0..1..0..3....0..1..2..1

%e ..1..0..1..2....1..0..1..0....1..2..1..3....1..0..2..1....1..2..3..0

%e ..2..1..3..3....2..1..0..2....0..1..2..1....0..2..1..3....2..3..2..3

%e ..3..2..3..3....3..0..2..1....1..3..1..2....3..1..3..0....1..0..3..1

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 29 2012

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)