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edited Apr 13, 2017 at 12:39

J, 11 bytes

1-<:2&*1-*:

Based on the same formula found earlier earlier.

Try it online!

Explanation

1-<:2&*1-*: Input: integer n
 *: Square n
 1- Subtract it from 1
 <: Decrement n
 2&* Multiply the value 1-n^2 by two n-1 times
1- Subtract it from 1 and return

J, 11 bytes

1-<:2&*1-*:

Based on the same formula found earlier.

Try it online!

Explanation

1-<:2&*1-*: Input: integer n
 *: Square n
 1- Subtract it from 1
 <: Decrement n
 2&* Multiply the value 1-n^2 by two n-1 times
1- Subtract it from 1 and return

J, 11 bytes

1-<:2&*1-*:

Based on the same formula found earlier.

Try it online!

Explanation

1-<:2&*1-*: Input: integer n
 *: Square n
 1- Subtract it from 1
 <: Decrement n
 2&* Multiply the value 1-n^2 by two n-1 times
1- Subtract it from 1 and return

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answered Jan 7, 2017 at 3:39

miles

answered Jan 7, 2017 at 3:39

miles

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J, 11 bytes

1-<:2&*1-*:

Based on the same formula found earlier.

Try it online!

Explanation

1-<:2&*1-*: Input: integer n
 *: Square n
 1- Subtract it from 1
 <: Decrement n
 2&* Multiply the value 1-n^2 by two n-1 times
1- Subtract it from 1 and return