Prerequisite -
PL/SQL introduction
In PL/SQL code groups of commands are arranged within a block. A block group related declarations or statements. In declare part, we declare variables and between begin and end part, we perform the operations.
Given n and task is to find nth
centered triangular number. A centered triangular number is a centered number that represents a triangle with a dot in the center and all other dots surrounding the center in successive triangular layers.
Examples:
Input: n = 6
Output: 64
Input: n = 10
Output: 166
The first few centered triangular number series are:
1, 4, 10, 19, 31, 46, 64, 85, 109, 136, 166, 199, 235, 274, 316, 361, 409, 460………………………
Approach
nth Term of centered triangular number is given by:
Below is the required implementation:
Output:
19
235
References:
https://en.wikipedia.org/wiki/Centered_triangular_number 
