Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsSimple 2-Column Polyominoes on the Hexagonal Latticehttp://demonstrations.wolfram.com/Simple2ColumnPolyominoesOnTheHexagonalLattice/]]>http://demonstrations.wolfram.com/Simple2ColumnPolyominoesOnTheHexagonalLattice/Two Types of Hexagonal Polyominoes Counted by Area and Number of Columnshttp://demonstrations.wolfram.com/TwoTypesOfHexagonalPolyominoesCountedByAreaAndNumberOfColumn/]]>http://demonstrations.wolfram.com/TwoTypesOfHexagonalPolyominoesCountedByAreaAndNumberOfColumn/