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A049867
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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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0
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1, 1, 4, 5, 10, 17, 33, 61, 115, 214, 400, 746, 1393, 2600, 4854, 9061, 16915, 31576, 58945, 110036, 205411, 383453, 715815, 1336255, 2494468, 4656574, 8692708, 16227203, 30292300, 56548466, 105562437, 197059777, 367863388
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