References to A111569

a(n) = a(n-1) + a(n-3) + a(n-4), a(0) = -1, a(1) = 1, a(2) = 2, a(3) = 1.
1, 1, 2, 1, 1, 4, 7, 9, 14, 25, 41, 64, 103, 169, 274, 441, 713, 1156, 1871, 3025, 4894

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