recursion the numbers in this series are called triangular numbers because they can be visualized as triangular arrangement of objectsshown as little squares in figure # # # # # # # figure the triangular numbers finding the nth term using loop suppose you wanted to find the value of some arbitrary nth term in the series--say the fourth term (whose value is how would you calculate itlooking at figure you might decide that the value of any term can be obtained by adding up all the vertical columns of squares in this column in this column in this column in this column total figure triangular number as columns in the fourth termthe first column has four little squaresthe second column has threeand so on adding + + + gives