
    Determine the number of possible ways to organize student intervention programs by grouping different risk factors, where each risk factor must be assigned to exactly one intervention group and any number of groups can be created. Each distinct arrangement of risk factors into intervention groups represents a unique program structure, and a risk factor cannot be split between multiple groups.
    

    
def bell_number(n):
    """
    Determine the number of possible ways to organize student intervention programs by grouping different risk factors, where each risk factor must be assigned to exactly one intervention group and any number of groups can be created. Each distinct arrangement of risk factors into intervention groups represents a unique program structure, and a risk factor cannot be split between multiple groups.
    

    """
def bell_number(n):
    """
    Determine the number of possible ways to organize student intervention programs by grouping different risk factors, where each risk factor must be assigned to exactly one intervention group and any number of groups can be created. Each distinct arrangement of risk factors into intervention groups represents a unique program structure, and a risk factor cannot be split between multiple groups.
    

    """
    bell = [[0 for i in range(n + 1)] for j in range(n + 1)]
    bell[0][0] = 1
    for i in range(1, n + 1):
        bell[i][0] = bell[i - 1][i - 1]
        for j in range(1, i + 1):
            bell[i][j] = bell[i - 1][j - 1] + bell[i][j - 1]
    return bell[n][0]