Select several numbers from 1, 2, 3...9 so that their sum is a multiple of 3, how many ways are there?
从1、2、3…9中选出若干个数，使它们的和是3的倍数，有多少种选法？
<gadget id="calculator">22 * 8</gadget>
<output>176</output>

<gadget id="calculator">176 - 1</gadget>
<output>175</output>

<result>175</result>