I like Julia and Python, however when I'm playing with doing math, or using paper, I like APL or J.

The above example in J:

   3 3 $ i.9

0 1 2

3 4 5

6 7 8

   3 3 $ >: i.9

1 2 3

4 5 6

7 8 9

J is 0-indexed. ">:" is the increment operator. APL allows you to set a parameter to do 1-indexed vs. 0-indexed.

APL:

   3 3 ρ ι9

1 2 3

4 5 6

7 8 9

There is a Calculus text for learning it with J:

https://www.jsoftware.com/books/pdf/calculus.pdf