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A200794 Number of n X n 0..3 arrays with values 0..3 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors 0

%I

%S 1,15,9880,132636590,26207146328784,75743730886453371522,

%T 3202145671418507455058837791

%N Number of n X n 0..3 arrays with values 0..3 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors

%C Diagonal of A200801

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Nov 22 2011

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Last modified October 19 22:05 EDT 2021. Contains 348095 sequences. (Running on oeis4.)