* https://en.wikipedia.org/wiki/Tower_of_Hanoi

 *

 * In case you're not familiar with JavaScript's conditional (ternary) 

 * operator, it's used below as a shortcut for if-else syntax. 

 * You can read about it here:

 *

 * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Conditional_operator

*/

​

/*

Parameters:

n: number of rings (1, 2, 3, ...)

​

Return value:

Required number of moves to solve Tower of Hanoi puzzle

*/

function T(n) {

  return n === 1 ? 1 : 2 * T(n - 1) + 1;

}

​

// test

for (let n = 1; n < 6; n++) {

  console.log(T(n));

}