[求助]一道数学计算的题

A．Adding Ones, Twos, and Threes
Time Limit: 1 Seconds Memory Limit: 32768 K
Description
Integer 4 can be expressed as a sum of 1s, 2s, and 3s in seven different ways as follows:
1+1+1+1, (1)
1+1+2, (2)
1+2+1, (3)
2+1+1, (4)
2+2, (5)
1+3, (6)
3+1. (7)
Write a program that determines the number of ways in which a given integer can be expressed as
a sum of 1s, 2s, and 3s. You may assume that the integer is positive and less than 36.

Input
The input consists of T test cases. The number of test cases (T ) is given in the
first line of the input file. Each test case consists of an integer written in a
single line.
Output
Print exactly one line for each test case. The line should contain an integer
representing the number of ways.
Sample Input
3
4
7
10
Sample Output
7
44
274