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A081860
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a(n)=sum(k=0,n-1, sigma(2k+1)*sigma_3(n-k)).
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0
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1, 13, 70, 247, 671, 1547, 3178, 5916, 10317, 17088, 26818, 40703, 60034, 85463, 119288, 163736, 218924, 288933, 377482, 482734, 612535, 772291, 955604, 1177050, 1443522, 1742481, 2097702, 2517368, 2978851, 3519151, 4152486, 4836104
(list; graph; refs; listen; history; internal format)
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