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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 47 - Try It (Browser)</title>
</head>
<body>
  <h1>Concentric Number Diamond (document.write)</h1>
  <p>Edit the size and click Run.</p>

  <script>
    var size = 5;
    var cols = 2 * size - 1;
    var center = size;

    for (var r = 1; r <= cols; r++) {
      var level = r <= size ? size - r + 1 : r - size + 1;

      for (var c = 1; c <= cols; c++) {
        var dist = Math.abs(center - c);
        var border = dist + 1;
        var val = Math.max(level, border);
        document.write(val + " ");
      }

      document.write("<br>");
    }
  </script>
</body>
</html>

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JavaScript Number Pattern 47 (Try It — Browser)