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Combinatorics
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Demonstrations 121  140 of 272
Two Types of Hexagonal Polyominoes Counted by Area and Number of Columns
How Many Right Triangles Can You Find?
Number of Handshakes
Stirling Numbers of the Second Kind and Nonattacking Rooks
U.S. City Tours
Folding a 2×n Sheet of Labeled Stamps
Proving Euler's Polyhedral Formula by Deleting Edges
Open Meanders
LittlewoodOfford Problem
Generating Permutations by a Sequence of Transpositions
The Number of Partitions into Odd Parts Equals the Number of Partitions into Distinct Parts
Tamari Lattice
The Birthday Problem and Some Generalizations
Projective Planes of Low Order
How Many Rectangles Are There?
Labeled Trees of 10 Vertices Using Prüfer Sequences
The Ancestral Genetic Code Cube
Combinatorics of Love from A Midsummer Night's Dream
Periodic BoxBall System
The Chinese Rings Puzzle
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