var input = 1352;

toBin = (number)=>(Number(number).toString(2).split("").map((a)=>(parseInt(a))));
evenSum = (parts)=>(parts.reduce((a, b)=>(a+b))%2 == 0);
checkCoord = (x, y)=>(evenSum(toBin(((x*x + 3*x + 2*x*y + y + y*y) + input))));

var previous = [];

function getNextCoords(x, y){
  var next = [];
  if(x > 0){
    if(checkCoord(x-1, y)){
      next.push([x-1, y]);
    }
  }
  if(y > 0){
    if(checkCoord(x, y-1)){
      next.push([x, y-1]);
    }
  }
  if(checkCoord(x+1, y)){
    next.push([x+1, y]);
  }
  if(checkCoord(x, y+1)){
    next.push([x, y+1]);
  }
  next = next.filter((pair)=>(previous.indexOf(pair.join(",")) == -1));
  next.forEach((pair)=>{previous.push(pair.join(","))});
  return next;
}

var coords = [[1,1]];

function getNextAllCoords(){
  return coords.map((pair)=>(getNextCoords(pair[0], pair[1]))).reduce((a, b)=>(a.concat(b)), []);
}

var i = 0;
while(i < 50){
  coords = getNextAllCoords();
  i++;
}
console.log("Locations visited: ", previous.length);