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# ASM Number

Returns the number of alternating sign matrices of the given order.
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C++
Excel

## Asm Number

 intasm_number( int n )
A direct formula for calculating the number of alternating sign matrices of order n is:


## References:

SUBSET, a C++ library of combinatorial routines, http://www.csit.fsu.edu/~burkardt/cpp_src/subset/subset.html

### Example 1

#include <codecogs/maths/combinatorics/sequences/asm_number.h>
#include <iostream>
int main()
{
for (int i = 0; i < 10; i++)
std::cout << i << " " << Maths::Combinatorics::Sequences::asm_number(i) << std::endl;
return 0;
}
Output:
0 1
1 1
2 2
3 7
4 42
5 429
6 7436
7 218348
8 10850216
9 188958604

### Parameters

 n the order of the matrices

### Returns

the number of alternating matrices of order n

### Authors

Lucian Bentea (August 2005)
##### Source Code

Source code is available when you agree to a GP Licence or buy a Commercial Licence.

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