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A088938
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Occurrences of 2's in A088936.
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4
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2, 3, 5, 10, 27, 104, 541, 3498, 26615, 231172, 2250129, 24227486, 285705643, 3660694200, 50624828357, 751426146514, 11913622408671, 200919532718828, 3591112295892985, 67803855263483142, 1348467602319393299
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OFFSET
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1,1
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LINKS
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FORMULA
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a(n)=2+(1/2)*sum(k=1, n, sum(i=0, k, i!)), [Benoit Cloitre and Claude Lenormand]
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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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