echo expr 0 \* 0 \+ 1 \* 1 \+ 2 \* 2 \+ 3 \* 3 \+ 4 \* 4 \+ 5 \* 5 \+ 6 \* 6 \+ 7 \* 7 \+ 8 \* 8 \+ 9 \* 9 \+ 10 \* 10 \+ 11 \* 11 \+ 12 \* 12 \+ 13 \* 13 \+ 14 \* 14 \+ 15 \* 15 \+ 16 \* 16 \+ 17 \* 17 \+ 18 \* 18 \+ 19 \* 19
shuf -i 0-19 -n 1 | xargs -I{} echo expr {} \* {} \+ {} \* {} \+ {} \* {} \+ {} \* {} \+ {}