Double sided arrow pattern

I am not able to code for this pattern . can you please explain how to do it.

Always first Try to first print pattern by ignoring the value to be printed then accommodate your value in that pattern
Input N is the number of rows.Given pattern is seen as first spaces ,then numbers ,then spaces and then numbers again. Till middle row, number of numbers in one batch in a row is equal to row number. After middle row, number of numbers decreases each time by 1.The max value in the pattern is in the middle row which is (N/2 +1).

–So do the work of spaces first ,then that of numbers in decreasing order, then that of spaces and then that of numbers in increasing order.

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