a(n) = a(n-1) + a(n-5); a(0) = ... = a(4) = 1. 1, 1, 1, 1, 1, 2, 3, 4, 5, 6, 8, 11, 15, 20, 26, 34, 45, 60, 80, 106, 140, 185, 245, 325
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