Generate two dimensional arrays with serial numbers

Generate n*n two dimensional arrays with serial numbers in python.

#!/usr/bin/env python3 -B


def gen_2d_array(n):
    d = [[] for _ in range(n)]
    for i in range(0, n * n):
        r = i // n
        d[r].append(i + 1)
    return d

print(gen_2d_array(abs(int(input("Enter n: ")))))


$ ./test_2darrays.py
Enter n: 10
[
    [1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
    [11, 12, 13, 14, 15, 16, 17, 18, 19, 20],
    [21, 22, 23, 24, 25, 26, 27, 28, 29, 30],
    [31, 32, 33, 34, 35, 36, 37, 38, 39, 40],
    [41, 42, 43, 44, 45, 46, 47, 48, 49, 50],
    [51, 52, 53, 54, 55, 56, 57, 58, 59, 60],
    [61, 62, 63, 64, 65, 66, 67, 68, 69, 70],
    [71, 72, 73, 74, 75, 76, 77, 78, 79, 80],
    [81, 82, 83, 84, 85, 86, 87, 88, 89, 90],
    [91, 92, 93, 94, 95, 96, 97, 98, 99, 100]
]
$

python algorithm