How to Print Fibonacci Series in Apex Salesforce

public class fibonacci {
public static void printnumber(){
integer n=10, firstterm =0,secondterm =1;
for(integer i=1;i<=n;i++){
integer nextterm = firstterm + secondterm;
firstterm=secondterm;
secondterm=nextterm;
system.debug('output' + nextterm);
} 
}
} 

EXECUTION IN ANANYMOUS WINDOW

OUTPUT: