Similar to 階乗

Matroid

Möbius function

Motzkin number

Young tableau

Finite geometry

Josephus problem

Latin square

Ramanujan's congruences

Alignments of random points

Lehmer code

Rogers–Ramanujan identities

Inshi no heya

Empty product

Fifth power (algebra)

Square (algebra)

Multiplication

Product (mathematics)

Primorial

Semiprime

Square number

Cube (algebra)

Perfect power

Special functions

George Andrews (mathematician)

Mourad Ismail

Generalized hypergeometric function

Airy function