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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 57 - Try It (Browser)</title>
</head>
<body>
  <h1>Centered Hollow Number Pyramid (document.write)</h1>
  <p>Edit n and click Run.</p>

  <script>
    var n = 5;
    for (var i = 1; i <= n; i++) {
      for (var s = 1; s <= n - i; s++) document.write("&nbsp;");
      if (i === 1) {
        document.write("1");
      } else {
        document.write(i);
        for (var gap = 1; gap <= 2 * i - 3; gap++) document.write("&nbsp;");
        document.write(i);
      }
      document.write("<br>");
    }
  </script>
</body>
</html>

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JavaScript Number Pattern 57 (Try It — Browser)