algorithm to generate numbers pattern

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algorithm

please help me to write a program to implement this algorithm..

write an algorithm to accept number between 1 and 9 and display the pattern.
For example, if the number entered is 5, the following pattern should be displayed:

a. Triangle pattern

1

2 1

3 2 1

4 3 2 1

5 4 3 2 1


b. Pyramid pattern

1

1 2 1

1 2 3 2 1

1 2 3 4 3 2 1

1 2 3 4 5 4 3 2 1


Thanks for your answer.. :)