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A064066
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n-th step is to add a(n) to each previous number a(k) (excluding itself, i.e., k < n) to produce n more terms of the sequence, starting with a(0)=1, a(1)=1.
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3
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1, 1, 2, 3, 3, 4, 4, 5, 4, 4, 5, 6, 5, 5, 6, 7, 7, 5, 5, 6, 7, 7, 8, 6, 6, 7, 8, 8, 9, 9, 5, 5, 6, 7, 7, 8, 8, 9, 5, 5, 6, 7, 7, 8, 8, 9, 8, 6, 6, 7, 8, 8, 9, 9, 10, 9, 9, 7, 7, 8, 9, 9, 10, 10, 11, 10, 10, 11, 6, 6, 7, 8, 8, 9, 9, 10, 9, 9, 10, 11, 6, 6, 7, 8, 8, 9, 9, 10, 9, 9, 10, 11, 10, 7, 7, 8, 9, 9
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OFFSET
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0,3
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LINKS
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EXAMPLE
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Start with (1,1). So after initial step have (1, *1*, 1+1 = 2), then (1, 1, *2*, 1+2 = 3, 1+2 = 3), then (1, 1, 2, *3*, 3, 1+3 = 4, 1+3 = 4, 2+3 = 5), then (1, 1, 2, 3, *3*, 4, 4, 5, 1+3 = 4, 1+3 = 4, 2+3 = 5, 3+3 = 6), etc.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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