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A049980 a(n)=number of arithmetic progressions of positive integers, strictly increasing with sum n. +0
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1, 1, 2, 2, 3, 4, 4, 4, 7, 6, 6, 9, 7, 8, 13, 9, 9, 15, 10, 12, 18, 13, 12, 20, 15, 15, 23, 17, 15, 28, 16, 18, 28, 20, 22, 33, 19, 22, 33, 26, 21, 39, 22, 26, 43, 27, 24, 43, 27, 33, 44, 31, 27, 50, 34, 34, 49, 34, 30, 60, 31, 36, 57, 38, 40 (list; graph; listen)
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Last modified December 5 23:38 EST 2009. Contains 170428 sequences.


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