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A078344
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a(1)=1; a(2)=2; a(3)=3; a(n) = sum(k=3,n-1,a(k) + a(k-1) + a(k-2) ).
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0
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1, 2, 3, 6, 17, 43, 109, 278, 708, 1803, 4592, 11695, 29785, 75857, 193194, 492030, 1253111, 3191446, 8128033, 20700623, 52720725, 134270106, 341961560, 870913951, 2218059568, 5648994647, 14386962813, 36640979841, 93317917142
(list; graph; refs; listen; history; internal format)
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