Tuesday, 16 October 2018

sequences and series - An expression for the sum sumlimitsn1k=1k,(nk)2

I really don't know how to find the sum of the series: n1k=1k(nk)2=1(n1)2+2(n2)2+3(n3)2++(n1)12.



My attempt:
I tried to approach the old school approach of how we find the sum of arithmetic-co geometric progression but unable to do so.



Any help is appreciated!

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