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ASM Triangle Row

Returns a row of the alternating sign matrix triangle.
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Asm Triangle Row

std::vector<int>asm_triangle_rowintn )
For a given n, the value of \inline  A(j) represents entry \inline  A(i, j) of the triangular matrix, and gives the number of alternating sign matrices of order n in which the (unique) 1 in row i occurs in column j.

For example, of alternating sign matrices of order 3, there are 2 with a leading 1 in column 1: 3 with a leading 1 in column 2: and 2 with a leading 1 in column 3:


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_triangle_row.h>
#include <iostream>
int main()
  std::vector<int> result = Maths::Combinatorics::Sequences::asm_triangle_row(4);
  std::cout << "Size of row: " << result.size() << std::endl;
  for (int j = 0; j < result.size(); j++)
    std::cout << result[j] << "  ";
  std::cout << std::endl;
  return 0;
Size of row: 5
42  105  135  105  42


the entries of the row


Lucian Bentea (August 2005)
Source Code

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