Count Sorted Vowel Strings LeetCode solution in Java

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class Solution {
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  public int countVowelStrings(int n) {
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    int a = 1, e = 1, i = 1, o = 1, u = 1;
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    for (int k = 1; k < n; k++) {
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      a = a + e + i + o + u;
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      e = e + i + o + u;
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      i = i + o + u;
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      o = o + u;
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    }
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    return a + e + i + o + u;
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  }
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}