To be honest: It's still in there.
I don't see why this code should be "obfuscation". Yes. It might be difficult to tell the precedence of << and >> (which is equal) or the associativity. But that's the same with any operator.
Just because it's seldom used doesn't make this a valid argument.
And I think bitshifting is more appropriate to the task at hand than multiplication. After all: I have to set one bit.
The only way I can think of making it clearer is either
(1<<$_)>>1
or
1<<($_-1)
The later I think is a bit unclear as one has to know that shifting left by a negative amount is in fact shifting right.
s$$([},&%#}/&/]+}%&{})*;#$&&s&&$^X.($'^"%]=\&(|?*{%
+.+=%;.#_}\&"^"-+%*).}%:##%}={~=~:.")&e&&s""`$''`"e
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