15 (+15-1), 29 (+29-2), 56 (+56-3), 109 (+109-4), 214 (+214-5), 423 (+423-6), 840
15,29,56,109,214, 423, 840
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15 (+15-1), 29 (+29-2), 56 (+56-3), 109 (+109-4), 214 (+214-5), 423 (+423-6), 840
15,29,56,109,214, 423, 840