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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 56 - Try It (Browser)</title>
</head>
<body>
  <h1>Centered Palindromic Number Pyramid (document.write)</h1>
  <p>Edit rows and click Run.</p>

  <script>
    var rows = 5;
    for (var i = 1; i <= rows; i++) {
      for (var j = rows; j > i; j--) document.write("&nbsp;&nbsp;");
      for (var k = 1; k <= i; k++) document.write(k + "&nbsp;");
      for (var m = i - 1; m >= 1; m--) document.write(m + "&nbsp;");
      document.write("<br>");
    }
  </script>
</body>
</html>

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JavaScript Number Pattern 56 (Try It — Browser)