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public String nthSeq(int n){
    String temp ="1";
    if(n==1) return temp;
    int num = n;
    while(num--!=0){
        StringBuilder r = new StringBuilder();
        for(int i =0; i < temp.length();){
            char cur = temp.charAt(i);
            int num_cur = 0;
            while(i < temp.length() && temp.charAt(i)==cur){
                num_cur++;
            }
            i += num_cur;
            r.append(String.valueOf(num_cur)+cur);
        }
        temp  = r.toString();
    }
    return temp;
}