```
# Python program to demonstrate
# the use of index arrays.
import numpy as np
# Create a sequence of integers from 10 to 1 with a step of -2
a = np.arrange(10, 1, -2)
print("\n A sequential array with a negative step: \n",a)
# Indexes are specified inside the np.array method.
newarr = a[np.array([3, 1, 2 ])]
print("\n Elements at these indices are:\n",newarr)
```

The output of the above code is:

A sequential array with a negative step: [-2, 9, 8, 7, 6, 5, 4, 3, 2, 1]

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