Evaluate
\left(2x^{3}+4x+1\right)^{7}
Expand
128x^{21}+1792x^{19}+448x^{18}+10752x^{17}+5376x^{16}+36512x^{15}+26880x^{14}+78400x^{13}+72240x^{12}+112896x^{11}+112000x^{10}+111384x^{9}+99456x^{8}+71824x^{7}+46676x^{6}+24864x^{5}+9296x^{4}+2254x^{3}+336x^{2}+28x+1
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