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A049866
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a(n)=Sum{a(k): k=0,1,2,...,n-4,n-2,n-1}; a(n-3) is not a summand; 3 initial terms required.
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1, 1, 3, 4, 8, 14, 27, 50, 94, 175, 327, 610, 1139, 2126, 3969, 7409, 13831, 25819, 48198, 89974, 167960, 313541, 585306, 1092626, 2039671, 3807577, 7107834, 13268623, 24769340, 46238423, 86316057, 161131397, 300793711
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