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<style>
div {text-align:center;}
span {margin-right:10px;}
</style>
<body>
<script type="text/javascript">
var n = 10;
var aArr = new Array();
var aDiv = new Array();
var aSpan = new Array();
for (var i = 0; i <n ; i++){
aArr[i] = new Array();
aDiv[i] = document.createElement("div");
for (var j = 0 ; j <=i ; j++){
if(j==0 || j==i)
aArr[i][j] = 1;
else
aArr[i][j] = aArr[i-1][j-1] + aArr[i-1][j];
aSpan[j] = document.createElement("span");
aSpan[j].appendChild(document.createTextNode(aArr[i][j]));
aDiv[i].appendChild(aSpan[j]);
}
document.body.appendChild(aDiv[i]);
}
</script>
</body>
</html>