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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 56 - Try It</title>
</head>
<body>
  <h1>Centered Palindromic Number Pyramid</h1>
  <p>Edit rows and click Run.</p>
  <pre id="output"></pre>
  <script>
    const rows = 5;
    let result = "";
    for (let i = 1; i <= rows; i++) {
      let line = "  ".repeat(rows - i);
      for (let k = 1; k <= i; k++) line += k + " ";
      for (let k = i - 1; k >= 1; k--) line += k + " ";
      result += line.trimEnd() + "\n";
    }
    document.getElementById("output").textContent = result;
  </script>
</body>
</html>

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JavaScript Number Pattern 56 (Try It)