Every programer first code

A=document.ptt.a.value;
a = Math.floor(Number(A)) + 1;
y = 0;
document.ptt.partizioni.value = "";

arr = new Array(a*a+1);
arr [0] = 0;
arr [1] = 1;
for (var x = 2; x < a*a; x++) {
  if (Math.floor(x/a)*a/x < a/(a+1) || x % a == 0) {
    arr [x] = 0;
  } else {
      arr [x] = arr [x-a-1] + arr [a*a*(Math.floor(x/a))-x*(a-1)];
  } }
arr [a*a] = 1;
for (var i = a*(a-1)+1; i < a*a+1; i++) {
  y = y + arr[i];
}

y--;

document.ptt.partizioni.value = y;