The numbers 1, 3, 6, 10, 15, 21, ... are called triangular numbers
because the number of units in each can be displayed as a triangular
pyramid of blobs. The 
, 
is computed from 
. Write an array valued function which takes one argument
(N) and returns a vector of the first N triangular numbers.
Make sure to specify the argument INTENT.
Write a test program to demonstrate the function and print out the sequence where N = 23.
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