Package de.tilman_neumann.jml.combinatorics

Class HyperFactorial

java.lang.Object

de.tilman_neumann.jml.combinatorics.HyperFactorial

public class HyperFactorial
extends Object

Hyperfactorials.

Author:

Tilman Neumann

Constructor Summary

Constructors

Constructor	Description
HyperFactorial()

Method Summary

Modifier and Type	Method	Description
static BigInteger	inverse(int n)	A000197 or what I call the "inverse hyperfactorial" is the product 1^n*2^(n-1)*..*(n-1)^2*n^1 = 1!*2!*3!*...(n-1)!*n!.
static BigInteger	standard(int n)	A002109 or the standard "hyperfactorial" is the product {1^1*2^2*..n^n}.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

HyperFactorial

public HyperFactorial()

Method Detail

standard

public static BigInteger standard(int n)

A002109 or the standard "hyperfactorial" is the product {1^1*2^2*..n^n}.

Parameters:

n -

Returns:

hyperfactorial(n)

inverse

public static BigInteger inverse(int n)

A000197 or what I call the "inverse hyperfactorial" is the product 1^n*2^(n-1)*..*(n-1)^2*n^1 = 1!*2!*3!*...(n-1)!*n!.

Parameters:

n -

Returns:

the "inverse hyperfactorial" of n aka 1!*2!*3!*...(n-1)!*n!