Calculate the middle number of a row of the pascal triangle
Ohm, 6 bytes

½⌠Ddac


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If the number is even it is you calculate (n n/2) if it is odd (n+1 (n+1)/2)

         Inplicit input
½        Half
 ⌠       Ceil
  D      Duplicate on stack
   d     x2
    a    Swap on stack
     c   Binomial