Looping on matrix entries

Create a $1010$ matrix $B$ whose entries $B_{ij}$ are defined as follows:

$B_{ij}=2i+j$ when $i=j.$

$B_{ij}=1+i^2-j^2$ when $ij$

i and $jin$ the formulas are zero$-$indexed, $i.e.$ they each range from $0to9.$

Recommended procedure:

Initialize $an$ empty array $of$ zeros $of$ the correct size $(1010)$ using $np.$ zeros

Loop $on$ the rows and columns $of$ the matrix and fill them $in$ according $to$ the formulas above. Use $\text{'}if\text{'}$ statements $as$ needed

Store your answer $in$ the variable $B$