$($Pascal$$sTriangle$)$Pascal$$strianglePnisatriangulararraywithn$+1$rows,eachlistingthecoefficientsofthe binomial expansion$($x$+$y$)$i$,$where$0$i$$n$.$For example,P$4$ is the triangulararray: $111121133114641$ The termPn$($i$,$j$)$iscalculatedasPn$($i$1,$j$1)+$Pn$($i$1,$j$),$where$0$i$$nand$1$j$.$ Accept n $($int$)$ as command$-$line argument Create a list a of size n $+1$ with all elements set to None $($use stdarray.create$1$D$())$ For each i in $[0,$n$]-$ Set a$[$i$]$ to a list of size i $+1$ with all elements set to $1($use stdarray.create$1$D$())$ For each i in $[0,$n$]-$ For each j in $[1,$i$)-$ Set a$[$i$][$j$]$ to a$[$i $1][$j $1]+$ a$[$i $1][$j$]$ For each i in $[0,$n$]-$ For each j in $[0,$i$]-$ If j $<$ i$,$ write a$[$i$][$j$]$ with a space after; otherwise, write a$[$i$][$j$]$ with a newline after