Sequences And Series

\({{{2^3} - {1^3}} \over {1 \times 7}} + {{{4^3} - {3^3} + {2^3} - {1^3}} \over {2 \times 11}} + {{{6^3} - {5^3} + {4^3} - {3^3} + {2^3} - {1^3}} \over {3 \times 15}}\, + \,...\, + \,{{{{30}^3} - {{29}^3} + {{28}^3} - {{27}^3}\, + \,...\, + \,{2^3} - {1^3}} \over {15 \times 63}}\) সমান _______________।