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A192643 Number of n X n symmetric 0..6 arrays with each element equal to at least one horizontal or vertical neighbor and any new values 0..6 introduced in lower triangular row major order 0

%I #5 Dec 18 2015 18:17:40

%S 0,1,5,137,17687,14704140,73684193256,2108942003884670

%N Number of n X n symmetric 0..6 arrays with each element equal to at least one horizontal or vertical neighbor and any new values 0..6 introduced in lower triangular row major order

%e Some solutions for 6X6 containing a 6

%e ..0..0..1..2..4..4....0..0..0..2..2..5....0..0..1..2..2..5....0..0..0..2..5..5

%e ..0..0..1..2..5..5....0..0..1..2..2..5....0..0..1..3..3..5....0..0..1..2..6..6

%e ..1..1..1..3..4..6....0..1..1..3..4..6....1..1..1..0..3..6....0..1..1..3..3..6

%e ..2..2..3..3..4..6....2..2..3..3..4..6....2..3..0..0..4..6....2..2..3..4..4..3

%e ..4..5..4..4..2..2....2..2..4..4..0..0....2..3..3..4..4..6....5..6..3..4..4..3

%e ..4..5..6..6..2..2....5..5..6..6..0..0....5..5..6..6..6..6....5..6..6..3..3..3

%K nonn

%O 1,3

%A _R. H. Hardin_ Jul 06 2011

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Last modified February 28 22:27 EST 2024. Contains 370400 sequences. (Running on oeis4.)