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A163881 Number of nXnXn triangular binary arrays with all 1s connected, no 1 having more than 2 1s adjacent, and a path of 1s from peak vertex to anywhere on the bottom side 0

%I #3 Mar 31 2012 12:35:32

%S 1,3,6,20,82,430,2890,25268,289456,4331282

%N Number of nXnXn triangular binary arrays with all 1s connected, no 1 having more than 2 1s adjacent, and a path of 1s from peak vertex to anywhere on the bottom side

%e All solutions for n=4

%e .....1........1........1........1........1........1........1........1...

%e ....1.0......1.0......1.0......1.0......1.0......1.0......1.0......0.1..

%e ...1.0.0....1.0.0....1.0.0....0.1.0....0.1.0....0.1.0....0.1.0....0.0.1.

%e ..1.0.0.0..0.1.0.0..0.1.1.0..0.0.1.0..0.0.1.1..0.1.0.0..1.1.0.0..0.0.1.0

%e ------

%e .....1........1........1........1........1........1........1........1...

%e ....0.1......0.1......0.1......0.1......0.1......0.1......1.0......1.0..

%e ...0.0.1....0.0.1....0.1.0....0.1.0....0.1.0....0.1.0....1.0.1....1.0.0.

%e ..0.1.1.0..0.0.0.1..0.0.1.0..0.0.1.1..0.1.0.0..1.1.0.0..0.1.1.0..0.1.1.1

%e ------

%e .....1........1........1........1...

%e ....1.0......0.1......0.1......0.1..

%e ...0.1.1....1.0.1....0.0.1....1.1.0.

%e ..0.0.0.1..0.1.1.0..1.1.1.0..1.0.0.0

%K nonn

%O 1,2

%A _R. H. Hardin_ Aug 06 2009

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Last modified May 28 01:34 EDT 2024. Contains 372900 sequences. (Running on oeis4.)