Question: The sequence (ay)y>1 starts 1,0,2,5,9,14 ... and has closed formula a, = which starts 4, 10, 18, 28,40, .. .. by > I (n+1)(n2) .

The sequence (ay)y>1 starts 1,0,2,5,9,14 ... and has closed formula a, = which starts 4, 10, 18, 28,40, .. .. by > I (n+1)(n2) . Use this fact to find a closed formula for the sequence (bn)n>1
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