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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 24 - Try It (Browser)</title>
</head>
<body>
  <h1>Centered Incremental Number Pyramid (document.write)</h1>
  <p>Edit the width and click Run.</p>

  <script>
    var width = 5;
    var k = 1;

    for (var i = 1; i <= width; i += 2) {
      for (var j = width; j >= 1; j--) {
        if (j > i) {
          document.write("&nbsp;&nbsp;");
        } else {
          document.write(k++ + "&nbsp;");
        }
      }
      document.write("<br>");
    }
  </script>
</body>
</html>

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JavaScript Number Pattern 24 (Try It — Browser)