Aztec diamondW
Aztec diamond
De Bruijn sequenceW
De Bruijn sequence
Catalan numberW
Catalan number
Dedekind numberW
Dedekind number
Double factorialW
Double factorial
Dyson conjectureW
Dyson conjecture
Eight queens puzzleW
Eight queens puzzle
Fence (mathematics)W
Fence (mathematics)
Graph enumerationW
Graph enumeration
Inclusion–exclusion principleW
Inclusion–exclusion principle
Lattice pathW
Lattice path
Necklace (combinatorics)W
Necklace (combinatorics)
Noncrossing partitionW
Noncrossing partition
Ordered Bell numberW
Ordered Bell number
Plane partitionW
Plane partition
Schröder–Hipparchus numberW
Schröder–Hipparchus number
SuperpermutationW
Superpermutation
Telephone number (mathematics)W
Telephone number (mathematics)