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A089978
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Expansion of 1/(1-3x-3x^3).
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1
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1, 3, 9, 30, 99, 324, 1062, 3483, 11421, 37449, 122796, 402651, 1320300, 4329288, 14195817, 46548351, 152632917, 500486202, 1641103659, 5381209728, 17645087790, 57858574347, 189719352225, 622093320045, 2039855683176
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