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A109537
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a(0)=a(1)=a(2)=a(3)=a(4)=a(5)=1; a(n)=a(n-1)+a(n-2)-a(n-4)+a(n-6) for n>=6.
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1
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1, 1, 1, 1, 1, 1, 2, 3, 5, 8, 12, 18, 27, 40, 60, 90, 135, 203, 305, 458, 688, 1033, 1551, 2329, 3497, 5251, 7885, 11840, 17779, 26697, 40088, 60196, 90390, 135729, 203810, 306040, 459548, 690055, 1036183, 1555927, 2336372, 3508284, 5268021, 7910433
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