let N=3;

let P=[];
for(let i=1; i<=N*N; i++) {
	P[i-1]=i;
}
let rememberPerm = [];
let permCount=0;
console.log(P);

function swap(i, k) {
  let temp = P[i];
  P[i] = P[k];
  P[k] = temp;
}
function perm(k) {
  if (k==0) {
 // console.log(P);
  	rememberPerm[permCount] = Object.assign({}, P);
    permCount++;
  }
  else {
    for(let i=0; i<=k; i++) {
      swap(i,k);
      perm(k-1);
      swap(i,k);
    }
  }
}

perm(P.length-1);

console.log(rememberPerm[1]);