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A192767 Number of n X n symmetric 0..4 arrays with each element equal to at least one horizontal or vertical neighbor, containing at least one 4 and with new values 0..4 introduced in lower triangular row major order 0

%I

%S 0,0,0,0,2432,5693147,22718529036,246577454328217,8154425735827153538,

%T 877838603725481966872516

%N Number of n X n symmetric 0..4 arrays with each element equal to at least one horizontal or vertical neighbor, containing at least one 4 and with new values 0..4 introduced in lower triangular row major order

%e Some solutions for 5X5

%e ..0..0..2..2..2....0..0..1..2..4....0..0..0..2..4....0..0..0..2..2

%e ..0..1..1..2..0....0..1..1..2..4....0..0..1..2..4....0..1..1..3..2

%e ..2..1..3..3..0....1..1..1..3..3....0..1..1..3..4....0..1..1..3..4

%e ..2..2..3..3..4....2..2..3..0..0....2..2..3..3..3....2..3..3..3..4

%e ..2..0..0..4..4....4..4..3..0..0....4..4..4..3..3....2..2..4..4..4

%K nonn

%O 1,5

%A _R. H. Hardin_ Jul 09 2011

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Last modified January 16 23:11 EST 2022. Contains 350377 sequences. (Running on oeis4.)