BlueBook - Triangle

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Points: 3
Time limit: 1.0s
Memory limit: 16M

Problem types

Given an integer N, output the first N rows of Pascal's triangle.

Input Specification

A single integer N (1 \le N \le 20).

Output Specification

The first N rows of Pascal's triangle, in order from top to bottom. Each row should be printed in a separate line, and the entries in each row should be printed from left to right with exactly one space between each pair of horizontally adjacent entries.

Sample Input


Sample Output

1 1
1 2 1


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